Uticaj različitih sistema uzgoja na proizvodnju, sastav mleka i ocenu telesne kondicije koza Alpina rase

This paper presents the results of testing the impact of different farming systems on milk production, milk composition (milk fat, protein and dry matter without fat) and body condition score of Alpine breed goats in different growing systems during one production year. Control of the amount and chemical composition of milk included a total of 59 French Alpine goats at the age of 2-3 years (2-3 lactations), which are divided into two groups with approximate similar body weight. In the first group of goats a stable diet was applied. Goats had a sufficient amount of alfalfa hay available (ad libitum) and the addition of about 0.5 kg of concentrate that is administered twice a day. Goats in the second group in addition to 0.5 kg of alfalfa hay, received 0.25 kg of concentrate and in the period from April to October during the day stayed at the outlet and the surrounding pasture. Control of body weight of goats and body condition were performed once every two months from March to October, while the rate of body condition (BCS) was given score of 1-5. Somatic cell count and chemical quality of milk were controlled on a daily basis in the laboratory for raw milk AD Mlekara - Subotica on the device CombiFoss 6200 FC. Both groups of goats had a statistically significant increase in production of milk (about 45 l) and the average daily milk yield (of about 0.15 l) in the second compared with the third lactation (p (lt) 0.01). It was also determined statistically significant effect of lactation on content of protein, dry matter without fat (DMwF) and the number of somatic cells in milk in both groups of goats. Body condition score of the analyzed groups of goats varied over time, and statistically significant differences were found in July (p = 0.021) and September (p = 0.013), where goats from the second group that remained at the pasture in the examined period had higher scores for BCS compared with the first group.U ovom radu prikazani su rezultati ispitivanja uticaja različitih sistema uzgoja na proizvodnju, sastav mleka (sadržaj mlečne masti, proteina i suve materije bez masti) i ocenu telesne kondicije koza rase Alpina u različitim sistemima uzgoja u toku jedne proizvodne godine. Kontrolom količine i hemijskog sastava mleka bilo je obuhvaćeno ukupno 59 koza francuske alpine u starosti 2-3 godine (2-3 laktacija), koje su podeljene u dve grupe sa približnom telesnom masom. Kod prve grupe koza primenjivan je stajski način ishrane. Koze su na raspolaganju imale dovoljnu količinu lucerkinog sena (ad libidum) kao i dodatak oko 0.5 kg koncentrata koji je davan u dva navrata u toku dana. Koze druge grupe su pored 0.5 kg lucerkinog sena, dobijale 0.25 kg koncentrata i u periodu od Aprila do Oktobra meseca su u toku dana boravile na ispustu i okolnom pašnjaku. Kontrola telesne mase koza i ocena telesne kondicije kontrolisane su jednom u dva meseca počev od marta do oktobra meseca, pri čemu je pri oceni TK davana ocena od 1-5. Broj somatskih ćelija kao i hemijski kvalitet mleka, kontrolisan je svakodnevno u laboratoriji za sirovo mleko AD 'Mlekare' - Subotica na aparatu CombiFoss 6200 FC. Obe grupe koza imale su statistički značajno veću proizvodnju mleka (za oko 45 l) i prosečnu dnevnu mlečnost (za oko 0.15 l) u drugoj u poređenju sa trećom laktacijom (p (lt) 0.01). Utvrđen je i statistički značajan uticaj laktacije na sadržaj proteina, suve materije bez masti (SMbM) i broja somatskih ćelija u mleku kod obe grupe koza. Ocena telesne kondicije analiziranih grupa koza varirala je tokom vremena, a statistički značajne razlike utvrđene su tokom jula (p=0.021) i septembra meseca (p=0.013), gde su koze druge grupe koje su u ispitivanom periodu boravile na pašnjaku, imale više ocene BCS u poređenju sa prvom

Autohtona Balkanska rasa koza - sastav i osobine jarećeg trupa

Investigations were realized within the program of protection of genetic resources of autochthonous goat breeds - Balkan goat breed. Trial was carried out on farms of individual producers, breeders on the territory of Svrljig region, on 12 male kids of average age of 63 days and average body mass prior to slaughtering of 10,54 kg. Objective of the research was to determine the meat yield (dressing percentage), share of by products of in body mass prior to slaughtering and in processed carcass, commercial value of carcass (by evaluation of conformation, covering of carcass and kidneys with fat tissue, colour of meat and tallow) and share of main carcass parts. Results of the research indicated that kids of Balkan goat breed at stated age have average body mass of 10,54 kg and yield of warm carcass with head and giblets of 58,89%, which is high value and is within the limits for yield realized by kids of approximate age of pure goat breeds. Shares of slaughter by products (rumen, small intestines, skin, abomasus), giblets (liver, lungs, heart, spleen, kidneys), fat tissue (peritoneum, kidney, mesentherium) and head in cooled carcass are also within the limits realized by kids of pure goat breeds. Commercial value of carcass, established based on assessment of conformation (scored as good), covering of carcass and kidneys with fat tissue (scored as medium), colour of meat and tallow (scored as very good) is good and within the values realized by kids of pure goat breeds. Quality of carcass evaluated based on share of main carcass parts of category I (thigh, loin part) of 33,41%, category II (back, shoulder, neck) of 38,68% and category III (breast, second fore thigh, second thigh) of 26,91%, was very good. Muscle, fat and binding tissue (meat in narrow sense) made 2/3, whereas bones made 1/3 of the mass of three rib cut, which is also very good. Ratio of muscle and fat tissue was also very favourable - 5,08.Ispitivanja su obavljena u okviru programa zaštite genetskih resursa autohtonih rasa koza - balkanske rase. Ogled je izveden kod individualnih odgajivača na području Svrljiškog regiona, na 12 muških jaradi prosečnog uzrasta 63 dana i prosečne telesne mase pred klanje od 10,54 kg. Cilj ispitivanja je bio da se utvrdi prinos mesa (randman), udeo pratećih proizvoda klanja u trupu pred klanje i u ohlađenom trupu, komercijalna vrednost trupa (ocenom konformacije, prekrivenosti trupa i bubrega masnim tkivom, boje mesa i loja) i udeo osnovnih delova trupa. Rezultati ispitivanja ukazuju da jarad balkanske koze u navedenom uzrastu imaju prosečnu telesnu masu od 10,54 kg i randman toplog trupa sa glavom i iznutricama od 58,89%, što predstavlja visoku vrednost i nalazi se u granicama vrednosti randmana koji postižu jarad približnog uzrasta plemenitijih rasa koza. Udeo pratećih proizvoda klanja (burag, tanka creva, koža, sirište), iznutrica (jetra, pluća, srce, slezina, bubrezi), masnog tkiva (peritoneum, bubrežno, opornjak) i glave u ohlađenom trupu su takođe u granicama koje postižu jarad plemenitijih rasa koza. Komercijalna vrednost trupa, utvrđena na osnovu ocene konformacije (ocenjena je kao povoljna), prekrivenosti trupa i bubrega masnim tkivom (ocenjena je kao osrednja), boje mesa i loja (ocenjene su kao veoma povoljne) je dobra i u okviru vrednosti koju imaju jarad plemenitijih rasa koza. Kvalitet trupa, procenjen na osnovu udela osnovnih delova trupa I kategorije (but, slabinski deo) od 33,41%, II kategorije (leđa, plećka vrat) od 38,68% i III kategorije (grudi, podlaktica potkolenica) od 26,91%, je veoma povoljan. Mišićno, masno i vezivno tkivo (meso u užem smislu) čini 2/3, dok kosti čine 1/3 mase trorebarnog isečka, što je veoma povoljno. Odnos mišićnog i masnog tkiva je takođe povoljan i iznosi 5,08

Effects of hygiene-sanitary measures on microbiological safety of finished product in butter production plant

This work presents the results of investigations of the effects of hygienesanitary measures at critical points in the technological process of butter production on its quality and microbiological safety. With this object in mind, hygiene safety was checked using the swab method at the machine for churning and packing butter (125 g packages and bulk butter), the equipment, hands and clothing (work aprons) of employees directly engaged on the machines. The evaluation of the safety parameters, as well as of the hygiene of the production process itself, was carried out in keeping with the Regulations on general and special conditions of food hygiene at any stage of production, processing and trade (RS Official Gazette, No.72/2010). The results of the hygiene safety of swabs taken from the 125g-butter packing machine, after sanitation, showed an increased number of mesophilic bacteria (up to 90 cfu/cm2), as well as the presence of bacteria from the Family Enterobacteriaceae (4 cfu/cm2). The results of swabs taken from the hands of workers engaged on the line for wrapping the butter following the churning process and on the packing line reveal the presence of aerobic mesophilic sporogenic bacteria (20 cfu/cm2), while the presence of pathogenic microorganisms was not established. Butter samples packed into 125g portions present more risky forms of commercial packaging than bulk butter, which is a consequence of various handling activities and additional outside contamination that takes place during the production process if continuous production in the plant has not been ensured. Moreover, the established presence of certain microorganisms (aerobic mesophilic microorganisms, lipolytic bacteria, as well as fungi) in packed butter during its shelf life, is largely a result of outside contamination and the hygienic condition of the equipment. The obatined results of the investigations indicate the need for special attention to be paid during the butter production process on meeting the hygiene-sanitary conditions during the production process tself, which primarily implies adequate washing and disinfecting of the equipment, the required temperature regimen for the pasteurization of the cream and similar activities, as well as the immaculate hygiene of the workers engaged in the production process. [Projekat Ministarstva nauke Republike Srbije, br. III 46009: Unapređenje i razvoj higijenskih i tehnoloških postupaka u proizvodnji stočne hrane sa ciljem proizvodnje visokokvalitetnih i bezbednih proizvoda konkurentnih na globalnom tržištu

Povezanost telesne razvijenosti i mlečnosti koza u različitim laktacijama

This paper presents the results of the variability and correlation of body measurements and milk production of domestic Balkan goat breed that is reared in the mountain range Sharplanina, depending on the lactation. Studied animals were monitored and lactation, or order of kidding (I, II, III and IV and the next lactation together). Control of milk production, included a total of 290 goats in different lactations (first-81 animals, the second-69 heads, 71 heads third-and fourth and following along latkacije-69 heads). In order to determine the measure of body development in adult goats, one takes values for height at withers, body length, chest depth, chest width, the width of the cross and body weight. The variability of the analyzed characteristics is presented descriptive parameters and the effect of lactation is determined by a factorial analysis of variance. The determined average values for milk production and measures of body development are located within those identified for this population of goats. During these tests showed statistically significant correlation dependence (P lt 0.05) between all studied variables, except when it comes to length lactation period and individual measures of body development. The correlation coefficient between length of lactation and established measures of body development. are low and reflect the existence uncorrelation dependence, and their values range from 0.08 to 0.11, while they were unjustified and statistically (P> 0.05).U radu su prikazani rezultati ispitivanja varijabilnosti i povezanosti osobina telesne razvijenosti i mlečnosti domaće balkanske rase koza u zavisnosti od laktacije po redu (I, II, III a IV i naredne laktacije zajedno). Kontrolom proizvodnje mleka bilo je obuhvaćeno ukupno 290 koza u različitim laktacijama (prva- 81 grla, druga- 69 grla, treća- 71 grla, a četvrta i naredne latkacije zajedno- 69 grla). U cilju utvrđivanja mera telesne razvijenosti odraslih koza izmerene su vrednosti za visinu grebena, dužinu trupa, dubinu grudi, širinu grudi, širinu krsta i telesnu masu. Varijabilnost analiziranih osobina opisana je parametrima deskriptivne statistike, a uticaj laktacije po redu je utvrđen jednofaktorijalnom analizom varijanse. Utvrđene prosečne vrednosti za proizvodnju mleka i mere telesne razvijenosti bile se u okviru onih koje su utvrđene za ovu populaciju koza. Ispitivanjem su utvrđene statistički značajne korelacije (P lt 0,05) između svih posmatranih parametara, izuzev kada je u pitanju dužina laktacionog perioda i pojedinih mera telesne razvijenosti koje statistički nisu bile značajne

Uticaj laktacije po redu na proizvodnju mleka i broj somatskih ćelija koza Alpina rase

In this paper, the annual results of the effect of lactation on milk production, the contents of some chemical parameters in the milk (milk fat, protein and dry matter without fat) and somatic cells in milk goat breeds Alpino in intensive production during one production year. Control is included a total of 82 French Alpine goats in different lactations (first-16 heads, the second-19 heads, 29 heads the third-and fourth and subsequent lactation together-18 heads).). Somatic cell count and chemical quality of milk is controlled on a daily basis in the laboratory for raw milk AD 'Dairies' - Subotica on the machine CombiFoss FC 6200. The variability of the analyzed characteristics is presented descriptive parameters and the effect of lactation is determined by a factorial analysis of variance. The average value for somewhat milk goats for the treated population was 362.83 kg, with average milk fat content of 3.31%. Analysis of variance confirmed that the differences that were established under the influence of lactation for all traits analyzed, except for percentage of milk fat, were significant at P lt 0.01.U ovom radu prikazani su rezultati ispitivanja uticaja laktacije po redu na proizvodnju mleka, sadržaj mlečne masti, proteina i suve materije bez masti i broj somatskih ćelija u mleku koza francuske rase Alpina u intenzivnoj proizvodnji u toku jedne proizvodne godine. Kontrolom je obuhvaćeno ukupno 82 grla u različitim laktacijama (prva - 16 grla, druga - 19 grla, treća - 29 grla, a četvrta i naredne latkacije zajedno - 18 grla). Broj somatskih ćelija, kao i hemijski kvalitet mleka, kontrolisan je svakodnevno u laboratoriji za sirovo mleko AD 'Mlekare' - Subotica na aparatu CombiFoss 6200 FC. Varijabilnost analiziranih osobina je prikazana parametrima deskriptivne statistike, a uticaj laktacije po redu je utvrđen jednofaktorijalnom analizom varijanse. Prosečna vrednost za ukupnu količnu mleka kod ispitivane populacije koza iznosila je 362,83 kg, sa prosečnim sadržajem mlečne masti od 3,31%. Rezultati analize varijanse potvrđuju da su razlike koje su ustanovljene pod uticajem laktacije po redu za sve analizirane osobine, izuzev za procenat mlečne masti, bile značajne na nivou P lt 0.01

Značaj vremena zalučivanja na telesnu masu i prirast jaradi

A group control system experiment was carried out to investigate the effect weaning time of kids on their health status and growth rate achieved up to 6 months of age. The experiment was done on kids obtained from crossbred domestic white x domestic Balkan goats and Alpino bucks. Investigations were done on a total of 120 kids, divided into 4 groups. Kids were weaned at 2 (Group 1), 20 (Group 2), 35 (Group 3), and 60 (Group 4), days. After weaning, kids in Group 1 and Group 2 were fed milk replacer containing 22% protein up to 35 days of age, while Group 3 and Group 4 were fed concentrates and hay. The lowest body weight, both by individual control periods, and at the end of the experiment, was established for kids in Group 2, weaned at 20 days of age. The also had the highest mortality. Highest body weight at this age (180 days) was found in kids in Group 4, weaned at 60 days. Established results permit the conclusion that kids can successfully be weaned as early as 35 days of age, and that weaning at an earlier age should not be done under our conditions, since it is not economically justified.Izveden je ogled po grupno-kontrolnom sistemu u cilju ispitivanja uticaja vremena odlučivanja jaradi na njihovo zdravstveno stanje kao i ostvarene priraste do uzrasta od 6 meseci. Za ogled su korišćena jarad dobijena ukrštanjem koza meleza domaće bele x domaća balkanska sa jarčevima alpino rase. Ispitivanja su izvedena na ukupno 120 jaradi, podeljenih u 4 grupe. Jarad su odlučivana u uzrastu od 2 (I grupa), 20 (II grupa), 35 (III grupa) i 60 (IV grupa) dana života. Posle odlučenja jarad I, i II grupe su napajana zamenama za mleko sa 22% proteina do uzrasta od 35 dana, dok su 3 i 4 grupa jaradi posle odlučenja hranjena koncentratom i senom. Najnižu telesnu masu, kako po pojedinim kontrolnim periodima tako i na kraju ogleda, imala su jarad II grupe koja su odlučena sa 20 dana starosti. Kod njih je istovremeno zabeležen i najveći mortalitet. Telesna masa u ovoj starosti (sa 180 dana) najveća je u jaradi IV grupe koja su odlučena u uzrastu od 60 dana. Rezultati ovih istraživanja pokazuju da je rano odlučivanje jaradi izazvalo stres praćen nižim prirastom koji je evidentiran kod prve dve grupe jaradi (a delimično i treće grupe) u prvih nekoliko dana posle odlučivanja. Kod jaradi četvrte grupe nije bilo nekih posebnih problema u periodu posle odlučenja, što je potvrđeno i rezultatima samih prirasta koji su u ovoj grupi bili najviši sve do uzrasta jaradi od 6 meseci. Mortalitet je bio izraženiji kod jaradi I i II grupe, u odnosu na druge dve, i to najčešće u periodima kada je kod oglednih grupa dolazilo do odvajanja od majki i početka napajanja zamenama za mleko

Korelaciona analiza proizvodnih osobina domaće balkanske koze

The paper presents results of investigations of the domestic Balkan goat reared in the Sharplanina mountainous region pertaining to phenotypic correlations between the most important production traits (milk production traits for 578 goats), and growth traits of kids (for 710 kids in the suckling period). Research was done in herds of Balkan goats belonging to private farmers, during a two-year period. Simple correlation between mentioned traits were calculated using a PC and the LSMLMW program (Harvey, 1990). Data pertaining to correlation coefficients established between investigated milk production traits of the domestic Balkan goat, reflect existing correlations, which in most cases, were positive and statistically significant (P (lt) 0,01). Very strong correlations were established between the 1st and 2nd milk production control, as well as between the daily milk yield and the 2nd milk production control (0.796), as well as the total milk yield (0.870). Established coefficient were also statistically significant (P (lt) 0,01). Correlation between birth weight and the weight at specific ages (30, 60 and 90 days) were strong and very strong, while correlations between birth weight and average daily weight gain established by individual months (0.526, 0.553 and 0.384) varied between weak and strong, with an established weakening of correlations with advancing age.Kod domaćih životinja postoje određene međusobne veze i uslovljenosti u ispoljavanju pojedinih proizvodnih i drugih osobina. Suština je u tome što ispoljavanje jedne pojave, osnovne osobine, manje ili više, uslovljava ispoljavanje druge pojave, odnosno osobine. Proučavanjem tih veza uočeno je da na njih mogu da utiču genetski i paragenetski činioci. U radu su prikazani rezultati ispitivanja fenotipskih korelacija između osobina mlečnosti (kod 578 koza) i porasta jaradi u dojnom periodu (kod 710 jaradi), domaće balkanske koze koja se odgaja na području planinskog masiva Šarplanine. Istraživanja su izvedena u stadima balkanskih koza privatnih odgajivača, u toku dvogodišnjeg perioda. Korelaciona zavisnost između navedenih osobina urađena je primenom programa LSMLMW (Harvey, 1990). Podaci o utvrđenim koeficijentima korelacije između ispitivanih osobina mlečnosti u domaće balkanske koze, odražavaju postojanje korelativne zavisnosti, pri čemu su u većini slučajeva bili pozitivni i statistički značajni (P (lt) 0,01), osim za utvrđene vrednosti ukupne količine mleka sa prvom i drugom kontrolom, kao i dnevne mlečnosti sa dužinom laktacije. Takođe, sve ustanovljene vrednosti za korelacije između osobina porasta jaradi u dojnom periodu (mase jaradi po pojedinim periodima uzrasta, dnevnog prirasta) su pozitivne i statistički vrlo značajne (P (lt) 0,01)

Klanični rezultati jaradi domaće balkanske koze

The paper presents the investigation of slaugher results, i.e. meat production results, in 96 kids of the domestic Balkan goat (4 herds, 24 animals per herd, 50:50 sex ratio), slaughtered at 90 days of age to determine the differences between the herds investigated and sexes (male kids vs. female ones), pertaining to the quantitative characteristics of meat. The average warm carcass dressing percentage including the head and offal for kids from all the herds investigated was 58.19%. The differences established for dressing percentage, warm, cold, and cold with and without head and offal, between the herds investigated and sexes were not statistically significant (P>0,05). Established differences between linear measurements for kid carcass halves, were statistically significant (P (lt) 0,01) between herds, whereas pertaining to the sex of kids, they were significant on both levels((P (lt) 0,01and P (lt) 0,05).Proizvodnja kozjeg mesa u svetu, iako je četiri puta manja od proizvodnje mesa ovaca, ima veliki značaj za mnoge zemlje, a naročito za zemlje Azije, Afrike i Južne Amerike. U zemljama Evropske zajednice je proizvodnja kozjeg mesa od znatno manjeg značaja i obima, a naročito u zemljama gde se gaje mlečne rase koza i u kojima je meso prateći proizvod. Mada će i u našim uslovima osnovni proizvod koza biti, uglavnom, mleko, proizvodnja mesa se ne sme zanemariti . Treba pravilno iskoristiti visoku potencijalnu mogućnost koza za dobru plodnost. Ova sposobnost koza može jako dobro da se iskoristi pri dvokratnom jarenju, i to tamo gde je proizvodnja jarećeg mesa rentabilnija od proizvodnje mleka i gde je iz bilo kojih razloga smanjen interes za proizvodnju mleka, ili pak nema uslova za organizovano unovčavanje većih količina mleka, niti za njegovu preradu. U radu su prikazani rezultati ispitivanja uticaja ishrane na klanične rezultate tj. proizvodnju mesa kod 96 jaradi domaće balkanske koze (4 stada, po 24 jaradi u svakom stadu i odnosom polova 50:50), koja su zaklana u uzrastu od 90 dana u cilju utvrdjivanja razlika između ispitivanih stada koza i polne pripadnosti jaradi (muška i ženska grla). Prosečan randman toplog trupa sa glavom i iznutricama kod jaradi svih ispitivanih stada iznosi 58,19%. Razlike koje su utvrdjene u masi toplog i hladnog trupa sa i bez glave i iznutrica, bile su statistički značajne (P (lt) 0,01) između ispitivanih stada, dok su te razlike u odnosu na polnu pripadnost (muška i ženska grla) bile izražene na nivou P (lt) 0,05. Rezultati analize varijante pokazuju da su evidentirane razlike između utvrdjenih linearnih mera na polutkama jaradi, bile statistički signifikantne (P (lt) 0,01) među stadima, dok su u odnosu na polnu pripadnost jaradi one bile značajne na oba nivoa (P (lt) 0,01 i P (lt) 0,05)

Uticaj laktacije po redu i telesne mase na prinos mleka i osobine plodnosti domaće balkanske koze

The goal of investigation in the domestic Balkan goat was to establish the effect of body weight and lactation number on milk yield and fertility. Research was done in herds belonging to private farmers, during a one-year period, on a total of 578 goats. Investigated herds were monitored also by lactation number, i.e. kidding number (lactations 1,2 and 3 individually, lactation 4 and following lactations investigated together). Body weight and milk yield were measured, while fertility was determined as the number of live born kids per 100 goats. Goats were also sorted into groups by age and body weight, while the interval within groups and between groups was 5 kg. Average total milk yield in the investigated population of the domestic Balkan goat was 177.5 kg. A statististically significant difference (P (lt) 0,01) was established for milk yield depending on body weight and age, except for goats in lactation 1 (P (lt) 0,05). In lactation 3 and 4, goats with body weights over 45 kg, comprising 30.23% of the total number in these groups, had the highest milk yields (over 200 kg). Pertaining to lactation number, i.e. kidding number, as well as body weight in both years of investigation, lowest fertility was found in lactations 1 and 2 (112%), and in goats with lowest body weight (25-30 kg), while this considerably increased lactation 4 and later lactations (136%), and body weights of over 40 kg (140%).Cilj ovih ispitivanja je bio da se utvrdi uticaj telesne mase, kao i uzrasta tj. laktacije po redu u domaće balkanske koze na njenu proizvodnju mleka i plodnost. Istraživanja su izvedena u stadima balkanskih koza privatnih odgajivača, u toku jednogodišnjeg perioda kod ukupno 578 grla koza. Kontrola mlečnosti je izvođena dvokratno u jednakim vremenskim intervalima pri čemu su sva grla bila u A kontroli. Plodnost je determinisana kao broj živorođene jaradi na 100 koza. Koze su, takođe, podeljene u grupe prema uzrastu i telesnoj masi, pri čemu je interval unutar i između grupa bio 5 kg. Prosečna vrednost za ukupnu količinu mleka kod ispitivane populacije koza iznosi 177,56 kg,. Statistički značajna razlika (P (lt) 0,01) je utvrđena za prinos mleka u zavisnosti od telesne mase i uzrasta kod svih ispitivanih grupa, izuzev za koze u prvoj laktaciji (P (lt) 0,05). U 3 i 4 laktaciji po redu, koze sa telesnom masom preko 45 kg, koje učestvuju sa 30.23% od ukupnog broja grla u ovoj grupi, imale su najveći prinos mleka (preko 200 kg). U zavisnosti od laktacije po redu tj., jarenja po redu, kao i telesne mase u obe godine istraživanja, najniža plodnost je ustanovljena u 1 i 2 laktaciji po redu (112%) i to kod koza sa najnižom telesnom masom (od 25-30 kg), dok se ona idući ka četvrtoj i kasnijim laktacijama po redu (136%) i telesnoj masi preko 40 kg (140%) znatno povećava. Statistički značajna razlika na nivou P (lt) 0,01, kada je u pitanju plodnost koza u zavisnosti od uzrasta tj. laktacije po redu i telesne mase utvrđena je kod svih ispitivanih grupa, izuzev kod koza u drugoj laktaciji (P (lt) 0,05)

Uticaj spoljnih i paragenetskih faktora na varijabilnost mase tela jagnjadi Mis populacije

The aim of the study was to determine effect of environmental and paragenetic factors on body mass of lambs at birth. Investigation was realized on experimental sheep farm of Institute for Animal Husbandry, Belgrade-Zemun. Animal included in this research were representatives of Mis sheep population. The results of the research confirm that values of the birth mass range from 4.43 kg to 4,58 kg observed by years and 4.48 kg to 4.55 kg depending on the lambing season. Statistical analysis showed that the existing differences still significant on the level (P (lt) 0.05). Variations of body mass in lambs depending on the mother's age range in the interval from 4.29 kg to 4.52 kg and statistically very significant(P (lt) 0.01). Type of birth has also expressed a significant effect on the body mass of lambs at birth and variations range from 4.31 kg (twins) to 4.59 kg (single). Existing differences was statistically very significant (P (lt) 0.01). Average body mass in lambs depending on sex of lamb were almost the same, 4.54 kg male and 4.52 kg female, and the difference is not statistically significant (P> 0.05).Polni žar kod većine ovaca u Srbiji ima sezonski karakter, što znači da ovce ispoljavaju estrus u toku letnjih meseci od jula do septembra. To je povezano sa mnogim genetskim i spoljnim faktorima počev od klime i trajanja svetlosnog dana do ishrane i drugih uticaja na organizam životinje. Najbolja potvrda ovome je da ovce iste rase ispoljavaju polni žar u različito vreme u zavisnosti od geografso-klimatskog područja gde se gaje (na primer: Engleska, Australija ili Srbija). Sa tim u vezi i jagnjenje ovaca pada u različitim sezonama, a kod nas pretežno tokom zimskih meseci, što nije najbolje sa aspekta plasmana jagnjadi. Zato je u primeni i takozvano vansezonsko jagnjenje, gde se ovce jagnje u različitom i planski definisanom periodu godine. Broj potomaka dobijenih po jagnjenju jedan je od najvažnijih pokazatelja produktivnosti ovaca. Drugim rečima, biološka efikasnost ovaca je uslovljena plodnošću odnosno sposobnošću reprodukcije. Masa jagnjadi pri rođenju ima veliku ulogu u ostvarenju profitabilne proizvodnje, jer od početne mase tela zavise ne samo prirast, već vitalnost i mortalitet jagnjadi. Na masu tela pri rođenju utiču brojni faktori genetske i paragenetske prirode. Ovim problemom su se bavili mnogi istraživači, a ta tema je aktuelna i danas. Rezultati naših istraživanja uticaja spoljnih i paragenetskih faktora na masu tela jagnjadi pri rođenju u populaciji Mis ovce, potvrđuju da za procenu genotipa treba poznavati više faktora negenetske prirode. Među njima su spoljna sredina (godina, sezona) koji se pre svega ogledaju preko ishrane, držanja i nege životinja tokom proizvodnog ciklusa, a posebno u toku bremenitosti. Pored spoljnih faktora, bitan uticaj na posmatranu osobinu imaju: starost majke, tip rođenja i pol jagnjadi, dakle faktori koje ne možemo zvati spoljnom sredinom, već određenom biološkom kategorijom, koju je najprikladnije nazvati paragenetskim uticajem. Svi ovi faktori u većoj ili manjoj meri, kako to potvrđuju ova istraživanja, utiču na masu tela jagnjadi pri rođenju i zato ih treba uzimati u obzir prilikom procene genetske vrednosti ovaca Mis populacije