Analysis of Survival in Dairy Cows with Supplementary Data on Type Scores and Housing Systems from a Region of Northwest Germany

Buenger, A.; Ducrocq, Vincent; Swalve, Hermann H.

doi:10.3168/jds.s0022-0302(01)70187-7

Cited by 61 publications

(125 citation statements)

References 15 publications

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“…With model 2, the variability of nongenetic random effect was higher (142%) than with model 1. These results were unexpected and in disagreement with the study by Buenger et al (2001), where a decrease of 53% was observed, and the study by van der Linde et al (2007), where a slight reduction in herd-year variance was found (from 0.229 to 0.224). Correction for milk production reduced the variability between herd-year quite importantly, whereas the change in total variability was not as large.…”

Section: Discussioncontrasting

confidence: 85%

Comparison of piecewise Weibull baseline survival models for estimation of true and functional longevity in Brown cattle raised in small herds

Jenko

Ducrocq

Kovač

2013

Animal

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Piecewise Weibull proportional hazard models were used to investigate the effect of genetic and nongenetic factors on functional and true longevity traits of the Slovenian Brown cattle breed. Records of 37 908 Brown cows from 2401 Slovenian herds were used. As these herds were characterised by a relatively small average herd size starting from 6.7 in 1999 and increasing to 8.7 Brown cows per herd in 2008, milk yield classification was made within different herd size groups. The hazard rate was the lowest in the first part of each lactation and was increasing for later stages. Culling risk was lower for cows from herds increasing in size, for cows with higher milk production and for cows from a region with smaller herd sizes and tougher conditions for cattle breeding. The latter result is surprising and may be related to better attention to maintain the animals, despite their lower milk production. The introduction of the milk quota system and drought was found to have an important effect on culling policy between the last seasons of the years 2001 and 2003. Seasonal effects were not related to the milk quota year (from April to March), but to the effect of shortage in fodder during the winter time. The effect of age at first calving and the interaction between year and milk yield class were not found to be significant. Heritability for functional and for true longevity were similar at around 10% each. Inclusion of a correction for class of milk yield to approximate functional longevity increased the herd-year random effect variance by 53%, whereas the sire variance increased by only 14%. The correlation coefficient between ranks of breeding values for functional and true longevity was high (0.91), whereas genetic trends were not found to be significant. To assess their predictive ability, models were compared looking at the survival rate of 4212 second-crop daughters not included in the initial models. The average correlation between estimated breeding values and survival at different stages was 0.39 for true longevity and 0.43 for functional longevity. Results showed that ranking milk yield at population level is appropriate to correct for voluntary culling on low production in small herds.

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Section: Discussioncontrasting

confidence: 85%

Comparison of piecewise Weibull baseline survival models for estimation of true and functional longevity in Brown cattle raised in small herds

Jenko

Ducrocq

Kovač

2013

Animal

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“…Our estimates ranged from 0.28 to 0.54, while the corresponding range for literature estimates was -0.07 to 0.21 (Cruickshank et al, 2002;Vukasinovic et al, 2002;Tsuruta et al, 2005). Buenger et al (2001), Larroque & Ducrocq (2001), and Schneider et al (2003) reported that cows with extremely close rear teats were more likely to be culled than cows with extremely wide rear teats.…”

Section: Resultsmentioning

confidence: 47%

“…This is not consistent with the fact that rear leg side view is an intermediate optimum trait. In fact, Buenger et al (2001) observed that sickled rear legs and extremely straight legs led to a lower functional length of productive life, a result that is in accordance with the curvilinear biological relationship between the two traits and indicates that the selected statistical approach may not be the most appropriate. Therefore, the negative genetic correlation that is observed in the current study should be interpreted cautiously.…”

Section: Resultsmentioning

confidence: 95%

Relationships between functional herd life and conformation traits in the South African Jersey breed

Toit¹,

Wyk²,

Maiwashe³

2012

SA J. An. Sci.

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________________________________________________________________________________ AbstractThe genetic relationship between conformation traits and functional herd life of the South African Jersey population was investigated. Data on conformation traits (n = 46 238) and functional herd life (n = 90 530) on registered South African Jersey cows calving between 1989 and 2008 were obtained from the Integrated Registration and Genetic Information System. Conformation traits were scored using a subjective linear scoring system ranging from 1 to 9, except for foot angle, with a maximum score of 8. Conformation traits included stature, chest width, body depth, dairy strength, rump angle, thurl width, rear leg side view, foot angle, fore udder attachment, rear udder height, rear udder width, udder support, udder depth, front teat placement, rear teat placement and front teat length. Genetic correlations between conformation traits and functional herd life were estimated by a series of bivariate analyses. Significant moderate to strong positive genetic correlations between most udder traits and functional herd life (0.23 to 0.63) were estimated. The most important udder traits related to functional herd life were fore udder attachment, rear udder height and udder depth. Most of the body structure traits had a low to moderate negative correlation with functional herd life (-0.04 to -0.27). However, rump angle and foot angle were estimated to have a moderate positive genetic correlation with functional herd life. The genetic relationships between functional herd life and conformation traits in the South African Jersey breed indicate that conformation traits could be used to enhance the accuracy of genetic evaluation for functional herd life. It is therefore recommended that current national genetic evaluation for functional herd life in the South African Jersey breed should include conformation traits. ________________________________________________________________________________

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“…The importance of udder depth as a main trait of udder conformation, that affects longevity and length of productive life, was confirmed by [21], [6], [24], [7], and especially by [18] and [9].…”

Section: Relation Between Length Of Productive Life and Conformation mentioning

confidence: 75%

“…Some authors [6,7] considered the rear udder attachment like one of the major trait of the udder affecting the longevity of cows.…”

Section: Relation Between Length Of Productive Life and Conformation mentioning

confidence: 99%

The Relationship Between the Length of Productive Life and the Body Conformation Traits in Cows

Strapák¹,

Juhás²,

Strapáková³

2011

JCEA

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The aim of this study was to analyze the length of productive life in 118 646 dairy cows of the Slovak Simmental breed. The average length of productive life reached 1451 days (3.98 years). The recorded factors with most important impact to the length of productive life were: milk production at first lactation (F = 7736.88+++), year of culling (F = 4890.54) and the age at first calving (F = 2759.81). The length of productive life was significantly affected by reason of culling (F = 272.43) and the Sire (F = 53.43). The analysis of effects of exterior traits to the length of productive life was done in group of 6585 culled cows. From the main exterior traits the most important impact was recorded for body frame (F = 17.39+++), udder (F = 9.43+++) and feet and legs (F = 6.41+++). For more detail advisement was tested the influence of partial exterior traits. From the partial exterior traits the most significant effect to length of productive live had udder depth (F = 26.04+++), teats length (F = 18.49+++), teats thickness (F = 3.23+++) and teats placement (F = 3.31++). From partial traits of feet and legs the most significant effect to length of productive live had heel joint expression (F = 9.10+++) and foot (F = 5.47+++). Results from the present study confirmed the important influence of main and partial exterior type traits of Slovak Simmental breed on the productive life of cows.Keywords: longevity, length of productive life, effects, type traits, Slovak Simmental breed Abstrakt V práci sme hodnotili úroveň dosahovaného produkčného veku 118 646 kráv slovenského strakatého plemena. Priemerný produkčný vek za celý sledovaný súbor predstavoval 1451 dní (3,98 roka). Na dĺžku produkčného veku kráv z definovaných faktorov najvýznamnejšie vplývali produkcia mlieka na prvej laktácii (F = 7736,88+++), rok vyradenia (F = 4890,54) a vek pri prvom otelení (F = 2759,81). Na produkčný vek kráv významne vplývali aj dôvod vyradenia a plemenný býk (F = 53,43). V populácii 6 585 vyradených kráv slovenského strakatého plemena sme analyzovali vplyv ukazovateľov exteriéru na dĺžku produkčného veku kráv. Z hlavných znakov exteriéru najvýznamnejšie vplývali na dĺžku produkčného veku kráv rámec tela (F = 17,39+++), vemeno (F=9,43+++) a končatiny (F=6,41+++). Pre detailnejšie posúdenie sme testovali úroveň vplyvu jednotlivých čiastkových znakov exteriéru. Z čiastkových znakov vemena najvýznamnejšie ovplyvňovali dĺžku produkčného veku kráv hĺbka vemena (F = 26,04+++), dĺžka ceckov (F = 18,49+++), hrúbka ceckov (F = 3,23+++) a postavenie ceckov (F = 3,31++). Z čiastkových znakov končatín najvýznamnejšie vplývali na dĺžku produkčného veku kráv slovenského strakatého vyjadrenie pätového kĺbu (F = 9,10+++) a paznecht (F = 5,47+++). Výsledky práce potvrdili významný vplyv hlavných a čiastkových znakov exteriéru kráv strakatého plemena na dĺžku produkčného veku kráv.Kľúčové slová: dlhovekosť, produkčný vek, nepriame úžitkové vlastnosti, exteriér, slovenské strakaté plemeno Detailed abstract V práci sme hodnotili úroveň dosahovaného...

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Analysis of Survival in Dairy Cows with Supplementary Data on Type Scores and Housing Systems from a Region of Northwest Germany

Cited by 61 publications

References 15 publications

Comparison of piecewise Weibull baseline survival models for estimation of true and functional longevity in Brown cattle raised in small herds

Comparison of piecewise Weibull baseline survival models for estimation of true and functional longevity in Brown cattle raised in small herds

Relationships between functional herd life and conformation traits in the South African Jersey breed

The Relationship Between the Length of Productive Life and the Body Conformation Traits in Cows

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