J. Péter Polgár

36824877800

Publications - 5

Population Genetic Features of Calving Interval of Holstein-Friesian Cows Bred in Hungary

Szabolcs Bene J. Péter Polgár László Bognár Zsolt J. Kőrösi F. Szabó

Publication Name: Animals

Publication Date: 2024-09-01

Volume: 14

Issue: 17

Page Range: Unknown

Description:

Calving interval (CI) data (N = 37,263) from 17,319 cows born 2008–2018 in six herds were assessed. The data were made available by the National Association of Hungarian Holstein Friesian Breeders in Hungary. The effects of some genetic and environmental factors, population genetic parameters, breeding value (BV) of sires, and phenotypic and genetic trends of the CI were estimated. The GLM method was used for studying different effects on the CI. BLUP animal model was used for heritability (h2) and BV estimation. Linear regression analyses were applied for the trend calculation. The mean of the CI was 412.2 ± 2.0 days. The h2 of the CI proved to be low (0.07 ± 0.01 and 0.08 ± 0.01). There were relatively high differences among the sires in the estimated BV. Based on the phenotypic trend calculation, the CI of cows showed decreasing direction by an average of 1.80 days per year (R2 = 0.94; p < 0.01). In the case of genetic trend calculation, the average BV of sires in the CI has decreased −4.94 and −0.31 days per year (R2 = 0.91 and 0.41; p < 0.01).

Open Access: Yes

DOI: 10.3390/ani14172513

Population genetic parameters and phenotypic trends based on soperformance tests data of native Gidran broodmares

Szabolcs Bene J. Péter Polgár László Rózsa Annamária Simon Dávid Mezőszentgyörgyi F. Szabó

Publication Name: Journal of Central European Agriculture

Publication Date: 2024-01-01

Volume: 25

Issue: 3

Page Range: 620-632

Description:

Body measurement and some conformation data recorded in the national breeding mare performance test of the Hungarian Association of Gidran Horse Breeders were processed. The initial database contained the data of the entire Hungarian active (living) breeding mare stock (N = 293), which were born between 1994-2016 and were offspring of 44 breeding stallions. During the study, eight traits-height at withers measured with stick and tape (HWS, HWT), chest girth (CHG), cannon circumference (left fore/front) (CAC), pedigree score (PES), conformation score (COS), movement score (MOS), total score (TOS)-were evaluated. One-and multi-trait analysis of variance (GLM) and weighted linear regression analysis were used to process the data. The corrected mean values (± SE) of the examined traits were as follows: HWS 161.6 ± 0.4 cm, HWT 169.6 ± 0.5 cm, CHG 188.4 ± 0.7 cm, CAC 19.9 ± 0.1 cm, PES 29.1 ± 0.3 points, COS 72.8 ± 0.5 points, MOS 40.5 ± 0.4 points, TOS 142.4 ± 0.7 points. The heritability of HWS, HWT, COS and TOS was moderate and high (0.37-0.47), CHG and CAC proved to be moderate (0.29-0.31), while low h2 values were estimated for MOS (0.20). In the case of body measurements, moderate, decreasing trends (b =-0.25,-0.33,-0.35 and-0.08 cm/year, respectively; P < 0.01), for the other traits while stagnant (NS) phenotypic trends were observed. It can be concluded that the average body measurements as well as the results of the other examined traits for the Gidran breeding mares did not change essentially over time.

Open Access: Yes

DOI: 10.5513/JCEA01/25.3.4235

Characteristics of meat production traits in the Hungarian Simmental herd selected for the simultaneous improvement of milk and meat production

Szabolcs Bene J. Péter Polgár Ákos Kovács Zoltán Kovács-Mesterházy F. Szabó

Publication Name: Archives Animal Breeding

Publication Date: 2023-01-01

Volume: 66

Issue: 3

Page Range: 233-244

Description:

Phenotypic and genetic trends, population genetic parameters, and the heritability and breeding values of the fattening and slaughter traits – namely muscularity score (MUS), final fattening weight (FFW), weight gain per day of life (WGD), slaughter weight (SLW), carcass weight (CAR), dressing percentage (DRP), bone–meat production per day of life (BMP), SEUROP conformation and fat coverage score (EUR, FAT), and meat percentage (MEP) – of 1162 Hungarian Simmental bulls were evaluated with the progeny test database of the Association of Hungarian Simmental Breeders. Trends were calculated by weighted linear regression analysis, while the population genetic parameters and breeding values used the BLUP (best linear unbiased prediction) animal model and general linear model (GLM). According to the results, the lowest heritability value (h2 = 0.23) was found in FAT. In the case of MUS, EUR and MEP, the values were moderate (h2 = 0.32, 0.26 and 0.32), and in the case of the other traits, high heritability values (h2 = 0.42–0.52) were estimated. The phenotypic trends of the fattening and slaughter traits of bull progeny born between 2001 and 2019 showed a stagnant direction. Between the sires, the differences in the breeding values for some traits (WDG, CAR and BMP) were large, and with other traits (DRP, EUR and FAT), small differences were found. According to the data of the genetic-trend calculation, the steepness values of the evaluated traits were positive, and the genetic trends showed a slightly improving direction in the estimated period.

Open Access: Yes

DOI: 10.5194/aab-66-233-2023

Genetic parameters of birth weight trait in dromedary camels (Camelus dromedarius)

Szabolcs Bene J. Péter Polgár P. Nagy F. Szabó J. Juhász

Publication Name: Tropical Animal Health and Production

Publication Date: 2020-09-01

Volume: 52

Issue: 5

Page Range: 2333-2340

Description:

Birth weight data of dromedary calves from the database of one of the world’s largest dairy herds (Dubai, UAE) were analyzed for the period from 2007 to 2018. The assessment included the data of 4124 camel calves that were classified into six ecotypes (Emirate, Emirate crossed, Black, Pakistanian, Saudi-Sudanian, and Saudi crossed). The aim of the study was to describe the heritability of birth weight of calves and the breeding value of sires. Genetic parameters of birth weight were estimated by ANOVA model and two BLUP animal models as well. The mean value of the camel calves’ birth weight was 34.75 ± 5.67 kg. The direct heritability of birth weight (h2d = 0.09 ± 0.04–0.11 ± 0.03) was rather low, so was the maternal heritability (h2m = 0.23 ± 0.10–0.50 ± 0.06). The maternal effect from environmental origin (c2 = 0.23 ± 0.08) far exceeded the results previously calculated in cattle. There was no difference in reliability between BLUP1 and BLUP2 models, and both of them were more accurate than the ANOVA model. Based on the results of this study, we conclude that the birth weight of dromedary calves was more influenced by the dam’s intrauterine rearing capacity and by the environment, management, and feeding of the pregnant female camels than the hereditary growth potential. Considerable differences were found among male dromedaries in their breeding values for the birth weight trait.

Open Access: Yes

DOI: 10.1007/s11250-020-02256-z

Ranking of beef cattle sires by their breeding value on progeny performance

Szabolcs Bene J. Péter Polgár Márton Szűcs F. Szabó

Publication Name: Journal of Central European Agriculture

Publication Date: 2020-01-01

Volume: 21

Issue: 4

Page Range: 697-706

Description:

The objective of this study was to rank Limousin sires by their different breeding values based on the weaning weight of their progeny. 205-day weaning weight record of altogether 18746 purebred and crossbred calves sired by breeding bulls of the mentioned breed were used for the estimation. Calves were belonging to three different groups by their genotype. Three different BLUP animal models were used for the estimation. According the results the direct heritability (h2) estimates of 205-day weight ranged between 0.49 and 0.59, while that of the maternal heritabilityd(h2) between m 0.24 and 0.45. The estimated breeding value of the given sires differed by the genotype (purebred or crossbred) of their progeny calves and the method of estimation. Also, there were differences in the rank of the sires depending on the genotype of their progeny, as well as the estimation methods.

Open Access: Yes

DOI: 10.5513/JCEA01/21.4.2821