12 research outputs found

    Estimation of genetic parameters and genotype effects for crossing constructions of Hungarian Pigs

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    Authors estimated the genetic parameters and genotype effects of average daily gain (ADG), age (AGE) and lean meat percentage (LMP) using the field test data of Pietrain (Pi), Duroc (Du), Hampshire (Ha) pigs and their crosses. Data was collected by the Agricultural Agency of Administration between 1998 and 2010 originating from 68 herds. Datasets of the different crossing combinations (Pi, Du, Pi × Du; Pi, Ha Pi × Ha) were evaluated separately using bivariate animal models. The estimated heritabilities were moderately low: 0.24–0.29, 0.22–0.26 and 0.18–0.19 for average daily gain (ADG), age (AGE) and lean meat percentage (LMP), respectively. The estimated genetic correlation coefficients were negligible: -0.07–0.01 (ADG-LMP), -0.01–0.04 (AGE-LMP). The Pi × Ha and Pi × Du crosses showed 6.76% and 4.96%; 6.74% and 4,17% and 0.08% and 0.44% heterosis for ADG, AGE and LMP, respectively. Among the environmental factors the herd effects were substantial: 41.17%, 53.67% and 14.16% for AGD, AGE and LMP, respectively. The smallest environmental influences were found for LMP

    Genetic Parameters of Growth Traits from a Joint Evaluation of Purebred and Crossbred Pigs

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    Authors analyzed average daily gain and lean meat percentage of the Pietrain (Pi), Duroc (Du) and their cross (PixDu); Pietrain (Pi) and Hampshire (Ha) and the cross (PixHa) using the national database for the period of 1997-2010. The heritability estimates for average daily gain (0.20±0.02, 0.24±0.02, 0.25±0.03, 0.37±0.06, 0.37±0.02 for Pi, Du, PixDu, Ha, PixHa, respectively); and lean meat percentage (0.17±0.02, 0.15±0.02, 0.13±0.02, 0.22±0.06, 0.20±0.02 for Pi, Du, PixDu, Ha, PixHa, respectively) were low. Genetic correlation between the purebreds and the crossbreds ranged from moderately high to high for average daily gain (0.93±0.15, 0.85±0.12, 0.56±0.14, 0.75±0.12) and from moderate to moderately high for lean meat percentage (0.65±0.16, 0.56±0.16, -0.38±0.17, 0.48±0.20) for Pi – PixDu, Du – PixDu, Ha – PixHa, Pi – PixHa, respectively. Based on the results the selection of the purebred parents for crossbred pigs can be based on the performance of their purebred breeding values of average daily gain. On the contrary for lean meat percentage the crossbred breeding values of the purebred pigs can also be used to select the best purebred pigs for crossing

    A vĂĄlasztĂĄsi stressz hatĂĄsa a malacok sĂșlygyarapodĂĄsĂĄra

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    In this study, authors examined the effects of parity number on piglet weight gain around weaning. The research was carried out on a Hunagrian pig farm on the litters of 3 first parity (P1) and 3 second parity (P2) Landrace x Large White sows. The traits examined were individual weight, weight gain, and number of deaths. A total of 90 piglets were individually weighed 9 times. Thus, measurements were taken at 1 day of age, at 10, 20, 26, 28, 29, 30, 36, and 47 days of age. Weaning occured on the 28th day. The difference in weight can be seen as early as 1 day of age between the piglets of the two groups (290 grams). The 1-day average weight of piglets in the P1 group was 1.20 kg, and the average weight of piglets of P2 sows was 1.49 kg (P <0.05). The observed difference remained until the end of the study, it was 2650 grams at 47 days of age. At this time, the mean weight of the piglets of P1 sows was 12.13 kg, while the average weight of the piglets of P2 sows was 14.78 kg (P <0.05). In terms of weight gains, there was a statistically significant difference between the two groups over four periods, including the post weaning periode. During this period, however, weight loss occurred. The weight of the piglets of P1 sows fell to a greater extent. In their case, the average daily weight loss at that time was 185 g. The other group had a weight loss of 80 g over the same period. Several of the piglets (95.2%) of P1 sows lost weight on the day after weaning while 73.5% of the piglets of P2 sows showed weight loss on this day. Based on the results it can be said that piglets of P1 sows are more sensitive to weaning than piglets of P2 sows. At the last measurement time point, there was no statistically significant difference between the performances of the two groups. There is a moderate association (R2=0.22) between the weight gains measured in the pre- and post-weaning period, with the weight of individuals gaining more in the pre-weaning period falling to a greater extent after weaning. There was a higher mortality rate among the piglets of the P2 sows. The weak piglets died in the first 4 weeks of the trial except for 1 piglet.A szerzƑk a vĂĄlasztĂĄsi stressz hatĂĄsĂĄt vizsgĂĄltĂĄk a malacok sĂșlygyarapodĂĄsĂĄra. A vizsgĂĄlatot egy magyar sertĂ©stelepen vĂ©geztĂ©k 3 elsƑ fialĂĄsĂș (P1) Ă©s 3 mĂĄsodik fialĂĄsĂș (P2) lapĂĄly x nagyfehĂ©r koca almaiban. A vizsgĂĄlt tulajdonsĂĄgok az egyedi sĂșly, sĂșlygyarapodĂĄs Ă©s az elhullĂĄsok szĂĄma voltak. Összesen 90 malacot mĂ©rtek le egyedenkĂ©nt 9 -szer. Így a mĂ©rĂ©seket 1 napos korban, 10, 20, 26, 28, 29, 30, 36 Ă©s 47 napos korban vĂ©geztĂ©k. A vĂĄlasztĂĄs a 28. napon törtĂ©nt. A sĂșlykĂŒlönbsĂ©g mĂĄr 1 napos korban lĂĄthatĂł volt a kĂ©t csoport malacai között (290 gramm). A P1 csoport malacainak 1 napos ĂĄtlagos sĂșlya 1,20 kg, a P2 kocĂĄk malacainak ĂĄtlagos tömege 1,49 kg (P <0,05) volt. A megfigyelt kĂŒlönbsĂ©g a vizsgĂĄlat vĂ©gĂ©ig megmaradt, 47 napos korban 2650 gramm volt. Ekkor a P1 kocĂĄk malacainak ĂĄtlagos sĂșlya 12,13 kg volt, mĂ­g a P2 kocĂĄk malacainak ĂĄtlagos sĂșlya 14,78 kg (P <0,05). A sĂșlygyarapodĂĄs tekintetĂ©ben statisztikailag szignifikĂĄns kĂŒlönbsĂ©g volt a kĂ©t csoport között hĂĄrom idƑszak alatt, beleĂ©rtve az elvĂĄlasztĂĄs utĂĄni periĂłdust is. Ebben az idƑszakban azonban sĂșlycsökkenĂ©s következett be. A P1 kocĂĄk malacainak sĂșlya nagyobb mĂ©rtĂ©kben csökkent. EsetĂŒkben az ĂĄtlagos napi fogyĂĄs ekkor 185 g volt. A mĂĄsik csoport sĂșlyvesztĂ©se 80 g volt ugyanebben az idƑszakban. A P1 kocĂĄknĂĄl a malacok közĂŒl többen (95,2%) vesztettek sĂșlyt az elvĂĄlasztĂĄst követƑ napon, mĂ­g a P2 kocĂĄk malacainak 73,5% -a mutatott sĂșlycsökkenĂ©st ezen a napon. Az eredmĂ©nyek alapjĂĄn elmondhatĂł, hogy a P1 kocĂĄk malacai Ă©rzĂ©kenyebbek a vĂĄlasztĂĄsra, mint a P2 kocĂĄk malacai. Az utolsĂł kĂ©t mĂ©rĂ©si idƑpontban, a malacok 36 Ă©s 47 napos korĂĄban nem volt statisztikailag szignifikĂĄns kĂŒlönbsĂ©g a kĂ©t csoport teljesĂ­tmĂ©nye között. Az elvĂĄlasztĂĄs elƑtti Ă©s utĂĄni idƑszakban mĂ©rt sĂșlygyarapodĂĄs között mĂ©rsĂ©kelt összefĂŒggĂ©s van (R2 = 0,22), az elvĂĄlasztĂĄs elƑtti idƑszakban jobban növekvƑ egyedek sĂșlya nagyobb mĂ©rtĂ©kben csökken az elvĂĄlasztĂĄs utĂĄn
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