165 research outputs found
MULTIPLE TRAIT ANALYSIS OF GENOTYPE BY ENVIRONMENT INTERACTION FOR MILK YIELD TRAITS IN SLOVENIAN CATTLE
The objective of the study was to evaluate genotype by environment interaction (GxEI) for yield traits in Holstein, Simmental and Brown breed cattle in Slovenia using multiple trait analysis. Data from Slovenian milk-recording scheme was used. The lactation records on cows having first to third calving in the period 1990-2004 and milk, protein and fat yield in 305 days were studied. The variables used to characterize the environment were herd-year averages of each trait. The multiple trait analysis was done using the highest and lowest quartiles of the environments. To study the GxEI, animal model methodology and the genetic correlation between the traits were used. GxEI was generally smaller for fat and milk yield than for protein yield. The lowest genetic correlations between high and low environments were estimated for protein yield, especially in Simmental (0.81) and in Brown (0.86) breed. In Holstein the correlation was higher, 0.94. The genetic correlations for fat yield were 0.95 for Brown and Simmental breed and 0.96 for Holstein. For milk yield the estimated genetic correlations were 0.88, 0.92 and 0.96 in Brown, Simmental and Holstein breed, respectively. Differences between variance components obtained in low and high quartile result in the rank of heritabilities from 0.04 to 0.12 in low and from 0.12 to 0.22 in high quartile
Harvester operator learnig efficiency analysis
Älanek obravnava naÄine uÄenja bodoÄih strojnikov za delo s strojem za seÄnjo.Na prvem takÅ”nem primeru v Sloveniji je opisan in analiziran potek uÄenja s simulatorjem in merjeni so Äasi posameznih postopkov pri dveh kandidatih. Opisano je delovanje simulatorja za uÄenje na stroju Timberjack 1270 D in potek enotedenskega teÄaja. Narejena je primerjava med kandidatoma glede porabe Äasa in Å”tevila poÅ”kodb na virtualnem stroju in sestoju, ki jih je beležil program simulatorja. Podane so usmeritve za prihodnje Å”tudije in spremljanje uÄinkov strojnikov pri delu.The article considers the possibilities of training future harvester operators. The course of learning with a simulator is described and analysed on the first such example in Slovenia. The times of individual processes are measured in two candidates. The paper describes the operation of a learning simulator for work on the harvester Timberjack 1270 D and the proceedings of aone-week course. A comparison between candidates regarding the consumption oftime and number of damages to the virtual machine and the stand is derived from the data recorded by the programme of the simulator. Directions for future studies and monitoring of operatorsÄ efficiency at work are also given
SLOVENIAN EXPERIENCE IN PIG CARCASS CLASSIFICATION ACCORDING TO SEUROP DURING THE YEARS 1996 TO 2004
Slovenian results on pig carcass classifi cation according to SEUROP (average lean meat percentage, carcass weight, measurements of fat and muscle and their variability) are presented for years from 1996 to 2004. In these years, an important increase of average lean meat percentage was noted (51.9 % in year 1996 vs. 55.9 % in year 2004). As a consequence the percentage of pig carcasses being graded into S and E classes was almost tripled from 1996 to 2004 (21.3 to 58.2%, respectively). This improvement was initiated by the payment according to the lean meat percentage, to which pig breeders responded by better management of herds and partly by increased use of pietrain breed. Potential for further improvement remains in attaining genetically more uniform herds and reduction of carcass weight variability. A new method, introducing an optic probe Hennessy, adapted to changes of the EU legislation, is expected to shift up the average meat percentage close to 57%, which places Slovenian pigs into the EU average
SLOVENSKE IZKUÅ NJE PRI OCENJEVANJU MESNATOSTI PRAÅ IÄEV PO SEUROP V LETIH 1996 DO 2004
Slovenian results on pig carcass classifi cation according to SEUROP (average lean meat percentage, carcass weight, measurements of fat and muscle and their variability) are presented for years from 1996 to 2004. In these years, an important increase of average lean meat percentage was noted (51.9 % in year 1996 vs. 55.9 % in year 2004). As a consequence the percentage of pig carcasses being graded into S and E classes was almost tripled from 1996 to 2004 (21.3 to 58.2%, respectively). This improvement was initiated by the payment according to the lean meat percentage, to which pig breeders responded by better management of herds and partly by increased use of pietrain breed. Potential for further improvement remains in attaining genetically more uniform herds and reduction of carcass weight variability. A new method, introducing an optic probe Hennessy, adapted to changes of the EU legislation, is expected to shift up the average meat percentage close to 57%, which places Slovenian pigs into the EU average.S prispevkom želimo predstaviti slovenske izkuÅ”nje pri ocenjevanju mesnatosti praÅ”iÄjih klavnih trupov po SEUROP sistemu v letih 1996 do 2004. Metoda, ki je bila vpeljana leta 1996 upoÅ”tevajoÄ EU zakonodajo in imenovana DM5, temelji na izraÄunu odstotka mesa v praÅ”iÄjem klavnem trupu na podlagi enaÄbe, ki vkljuÄuje dve meritvi na liniji razseka trupa; meritev F, ki je debelina slanine na mestu, kjer je ta najtanjÅ”a oziroma kjer se m. gluteus medius najbolj vraÅ”Äa v slanino ter meritev M, ki je razdalja med kranialnim robom m. gluteus medius in dorzalnim robom hrbteniÄnega kanala, kot kazalcem debeline hrbtne miÅ”ice (slika 1). Zbrali smo meseÄne statistiÄne podatke (popreÄja in standardne odklone) za obdobje od julija 1996 do decembra 2004 za lastnosti, ki se merijo ali izraÄunajo; za meritvi M in F, za odstotek mesa v trupih in klavno težo trupov. Zbrane podatke smo prikazali na letni osnovi (preglednica 1). Z regresijsko analizo, oziroma uporabo procedure REG statistiÄnega paketa SAS, smo ocenili meseÄne trende ter jih
grafi Äno prikazali. Rezultati ocenjevanja mesnatosti praÅ”iÄev na klavni liniji kažejo na velik napredek v mesnatosti praÅ”iÄev. PopreÄni odstotek mesa v trupih se je dvignil iz 51,9 % v letu 1996 na 55,9 % v letu 2004 (preglednica 1), kar v obliki trendov predstavlja statistiÄno znaÄilen (p<0,001) pozitiven trend na ravni 0,045 % meseÄno oziroma 0,54 % letno (slika 7). Ta napredek v mesnatosti pripisujemo predvsem uvedbi plaÄevanja na osnovi odstotka mesa v trupih ter poslediÄno izboljÅ”anju rejskega dela ter deloma tudi veÄji uporabi pasme pietrain pri križanju; ne moremo pa jih pripisati spremembam v teži klavnih trupov, saj se ta ni bistveno spremenila (preglednica 1). Rezerve za izboljÅ”anje klavne kakovosti praÅ”iÄev ostajajo v zagotavljanju veÄje izenaÄenosti populacije glede na klavno težo in mesnatost. Ugotavljamo namreÄ veliko variabilnost v klavni teži (preglednica 1), ki bi jo bilo mogoÄe izboljÅ”ati z ustrezno plaÄilno shemo (pribitki oziroma odbitki glede na klavno težo) ter veliko variabilnost v mesnatosti, ki je delno posledica variabilnosti v teži, delno pa velikega Å”tevila razliÄnih genotipov v relativno majhni populaciji praÅ”iÄev. V letu 2004 naj bi se uveljavila nova metoda, ki temelji na uporabi optiÄne sonde Hennessy Grading Probe in je prilagojena spremembam EU zakonodaje. PriÄakujemo, da bo nova metoda dvignila popreÄno mesnatost blizu 57 %, ta rezultat pa uvrÅ”Äa mesnatost slovenskih praÅ”iÄev v EU popreÄje
Growth and Mortality of Suckling Rabbit
Rabbits are usually smaller and mortality is higher in large litters. The aim of the study was to estimate effects on mortality and growth in rabbits. The study was carried out in Slovenian SIKA sire line. In total, 430 kits of 60 does were included. In the analyses the effects of parity, number of liveborn kits and number of teats were analysed. Initial weight was included in the model for mortality, while age was included in the model for growth. Parity, litter size and teat number affected all traits, except on mortality. Body weight varied according to age. A total of 430 kits were observed, corresponding to an average litter size of 7.8 kits born, 7.3 kits born alive and 6.2 kits weaned. The birth to weaning mortality was 15.35% and mortality has steadily declined with age. Average weight up to age of three days was 75 g and at weaning 1035 g. Kits in smaller litters had a higher growth rate
Study of genetic diversity of Bisaro pigs breed by pedigree analysis
The objective of this work was to study the genetic diversity of the Portuguese autochthonous
pig breed BĆsaro by pedigree analysis. Data of BĆsaro pigs breed was taken from the database of the
National Breeders (Association AssociaĆ§Ć£o Nacional de Criadores de SuĆnos de RaƧa BĆsaro -
ANCSUB) concerning the period from 1997 to 2008. For both, pedigree and active population files
completeness was evaluated. The number and the proportion of animals with both parents known,
sire known, and dam known were computed using the SQL procedure. Population genetic diversity
parameters were computed, using the PEDIG software package, for the active population which
included animals born from 2003 to 2008. The effective number of founders was 78.8 for boars and
79.7 for sows, while the number of ancestors contributed with 50% of the genes in the breed pool
gene was 24 for boars and 23 for sows. A high proportion (52.4%) of animals in the active
population are inbred, and 43.9% of the inbreed animals presented inbreeding coefficient higher
than 20%. These results suggest that genetic variability needs monitoring in order to avoid the
losses of genes in the BĆsaro pigs
The Effect of Dam Breed on Calf Mortality in the First Month of Life in Slovenia
The aim of this study was to estimate the perinatal and neonatal mortality rates from day 2 to 30 in Slovenian calves and to evaluate risk factors for increased losses. We analysed data on 1,333,765 calves of different dam breeds, born in Slovenia in the period from January 1 to December 31st, 2012. Data were obtained from the Central register of bovine animals. The average perinatal calf mortality, including abortions and stillbirths, was 5.57% and 2.68% from day 2 to 30. The most significant effects on perinatal calf mortality rate were the number of calves at calving, age of the dam at calving, the herd size, while herd size and calving season were the most influential in the following neonatal period from day 2 to 30. Calves from Holstein Friesian dams showed much higher perinatal and neonatal mortality rates than calves from Simmental, Brown and other dam breeds. With increased herd size, the perinatal and neonatal mortality rate increased. This increase was more pronounced in Simmental, Brown and other dam breeds than in Holstein Friesian dams
Utjecaj vlasniÄke i posjedovne strukture na spremnost Å”umoposjednika na povezivanje
Private forest management is, particularly in Slovenia, far from optimal. The reason lies in the diversity of ownership and property structure. In addition, Slovenian private forest owners are not adequately organized and associated to manage their forests. The willingness of private forest owners to cooperate was evaluated using the questionnaires. The sample (n=700) included equal shares of associated and non-associated owners. Forty-six percent of questionnaires were returned. The results of the survey analysis showed that 39.1 % of private forest owners were members of forestry associations (associated), 19.9 % owners showed willingness to cooperate i.e. to join a forestry association and 41.0 % of the sampled forest owners were unwilling to cooperate. Based on the data obtained through the survey we have studied the relationship between ownership and property conditions in regard to the willingness of forest owners to cooperate. The Chi-square test showed the statistical significance of the relationship between the size of forest property and the willingness of owners to cooperate. Further, the results of multivariate logistic regression showed that it is necessary to search for private forest owners who are willing to cooperate in the group of forest owners who are younger than 50 years, who own more than 10 ha of forest land and live in common household with the co-owners.Gospodarenje privatnim Å”umama, posebice u Sloveniji, nije optimalno. Na to najviÅ”e utjeÄe i raznolika vlasniÄka i posjedovna struktura.Å umoposjednike u gospodarenju njihovim Å”umama posebice ograniÄava mali i usitnjeni Å”umski posjed s velikim brojem vlasnika i suvlasnika. Zbog toga je znaÄajno da se Å”umoposjednici poÄinju udruživati u razliÄite organizacijske oblike povezivanja.
PredviÄamo da spremnost Å”umoposjednika za povezivanje ponajprije ovi si od neposrednih ekonomskih i socijalnih interesa Å”umoposjednika te od veliÄine i stanja njihovog Å”umskog posjeda. Spremnost Å”umoposjednika za povezivanje utvrÄivali smo anketiranjem. Zbog razliÄitih prirodnih i druÅ”tvenih prilika, posjednike Å”uma anketirali smo u cijeloj Sloveniji. Na temelju indeksa Å”umoposjednika, posjednike smo podijeli u pet grupa po veliÄini posjeda. Unutar ovih grupa podjelili smo ih na povezane i nepovezane. Uzorak ispitanika (n=700) predstavljali su sustavno izabrani Å”umoposjednici. Na anketu je odgovorilo 46 % ispitanika. Uzorak je obuhvatio 322 pretežito muÅ”ka Å”umoposjednika. ProsjeÄna starost anketiranih vlasnika je 54 godina, s prosjeÄno zavrÅ”enom osnovnom ili trogodiÅ”njom srednjom Å”kolom. VeÄina anketiranih Å”umoposjednika živi u ruralnim sredinama. ProsjeÄni Å”umski posjed iznosi 16,7 ha i nalazi se u 4,3 pros torno odvojena kompleksa. Prevladava oblik vlasniÅ”tva bez suvlasniÅ”tva, a Å”umoposjednici koji su u suvlasniÅ”tvu imaju prosjeÄno osam suvlasnika. U uzorku je 39,1 % anketiranih Å”umovlasnika veÄ ukljuÄeno u razliÄite oblike povezivanja, 19,9 % ih je spremno ukljuÄiti se u razliÄite oblike povezivanja, dok 41 % Å”umoposjednika povezivanje ne interesira. Rezultati bivarijantne analize ukazuju na povezanost spremnosti za povezivanjem Å”umoposjednika i veliÄine njegovoga posjeda. VeÄu spremnost za povezivanje pokazuju Å”umoposjednici koji imaju viÅ”e od 10 ha Å”uma. Rezultati multivarijantne analize pokazuju da se Å”umoposjednici koji pokazuju spremnost za povezivanje i Å”umoposjednici koji nisu spremni za povezivanje, razlikuju po veliÄini posjeda, starosti i obliku vlasniÅ”tva (vlasnika je viÅ”e i svi žive u istom kuÄanstvu). Rezultati istraživanja pokazali su da treba Å”umoposjednike koji su spremni za povezivanje tražiti u grupi Å”umoposjednika koji su stari do 50 godina, imaju Å”umski posjed veÄi od 10 ha i koji sa suvlasnicima žive u istom kuÄanstvu
- ā¦