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001-es BibID:	BIBFORM059806
Első szerző:	Posta János (informatika tanár, agrármérnök)
Cím:	Evaluation of the length of competitive life in Hungarian sporthorses / Posta János, Rudiné Mezei Anita, Mihók Sándor, Mészáros Gábor
Dátum:	2014
ISSN:	0931-2668
Megjegyzések:	The aim of this study was to analyse the duration of the competitive life of jumping horses in Hungary to assess the potential for genetic evaluation and to get information about the risk factors affecting jumping performance of sport horses. The data set included lifetime performance in jumping competitions for 8475 horses born from 1992 onwards with records between 1996 and 2011 (32.7% were right-censored). Longevity was measured as the number of years spent in the competition. Discrete time survival model included fixed effects of gender, age at first competition, and the time-dependent effect of competition level. All fixed effects were highly significant (p < 0.001). The highest risk of ending the race career was estimated for horses competing in the lowest level (category 1) events. The smallest risk was found in horses competing in the highest category. The culling risk for stallions was 15% higher, for geldings 20% lower when compared to mares. As the age at the first competition result increased, the risk ratio also increased. Risk ratios of horses starting as 8 years old or older were 56% higher than those of 5-year-old horses. The longest time in sport tracks belonged to horses starting their career as 4 years old. Their culling risk was 20% lower than those of 5-year-old horses. The heritability of the length of competitive life was 0.17. Breeding values were predicted for each animals, and 47 showed an accuracy greater than 0.60. The clear benefit of the analysis was shown by comparison of offspring to extreme stallion groups.
Tárgyszavak:	Agrártudományok Állattenyésztési tudományok idegen nyelvű folyóiratközlemény külföldi lapban Genetic parameters hungarian sport horse showjumping survival analysis
Megjelenés:	Journal of Animal Breeding and Genetics 131 (2014), p. 529-535. -
További szerzők:	Rudiné Mezei Anita (1987-) (alkalmazott matematikus) Mihók Sándor (1950-) (agrármérnök) Mészáros Gábor
Pályázati támogatás:	OTKA-PD83885 OTKA
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM097793
035-os BibID:	(cikkazonosító)3065 (WoS)000807166000001 (Scopus)85117914626
Első szerző:	Török Evelin (mezőgazdasági mérnök)
Cím:	Combinations of Linear Type Traits Affecting the Longevity in Hungarian Holstein-Friesian Cows / Török Evelin, Komlósi István, Szőnyi Viktor, Béri Béla, Mészáros Gábor, Posta János
Dátum:	2021
ISSN:	2076-2615
Megjegyzések:	Simple Summary The selection for high-level milk production shortened the productive life of cows. In Hungary, the average number of lactations is only ca. 2.1. At the same time, the longevity, health status, milk production and reproduction were affected by the linear type traits, confirmed by several research studies. These studies, however, looked at the association of the linear type traits with longevity, using only one trait at a time. To take into account the connections between linear type traits, their combinations based on statistical analyses were considered. Identification of the risk ratio of various trait combinations could support corrective mating and bull selection. Several research studies confirm the association of the linear type traits with longevity, but only with one trait at a time. The aim of our study was to analyse the influence of combinations for linear type traits on longevity in the Hungarian Holstein-Friesian cows. Data were provided by four herds; the filtered dataset consisted of 17,717 cows. From the 14 available linear type traits, the most important combinations were identified based on principal components and cluster analysis. From the six identified combinations, only three (chest width-body depth, fore udder attachment-udder depth, angularity-rear udder height) proved to have a significant effect on longevity. A wide chest and deep body caused a high-risk ratio of culling. The lowest risk ratio was observed with cows having intermediate chest width and intermediate body depth. Very angular cows having low rear udder height were at the highest risk of culling. The lowest culling risk was found in cows with a lack of angularity and high rear udder height. Weak and loose fore udder along with deep udder had increased culling risk. Strong and tight fore udder subclasses were the most favourable as their risk ratios decreased towards the shallowing of udder depth.
Tárgyszavak:	Agrártudományok Állattenyésztési tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Animals. - 11 (2021), p. 1-12. -
További szerzők:	Komlósi István (1960-) (agrármérnök) Szőnyi Viktor Béri Béla (1951-) (agrármérnök) Mészáros Gábor Posta János (1978-) (informatika tanár, agrármérnök)
Pályázati támogatás:	EFOP-3.6.3-VEKOP-16-2017-00008 EFOP
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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