Variations in Removal Reasons and Culling Rates with Age for Dairy Females

Allaire, F.R.; Sterwerf, H.E.; Ludwick, T.M.

doi:10.3168/jds.s0022-0302(77)83862-9

Cited by 69 publications

(33 citation statements)

References 10 publications

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“…The remarkable percentage of culling resulting from reproductive problems in the current study may be partially explained by the difference in the climatic conditions of Iran and the origin of Holstein cows. Similar findings were reported by some other authors (Allaire et al 1977;Bascom & Young 1998;Ruegg et al 1998). Mohammadi and Sedighi (2009) and Shahmoradi et al (2008) reported that infertility and reproductive problems are major factors in culling Holstein cattle in other regions of Iran.…”

Section: Resultssupporting

confidence: 93%

“…In addition, animals culled because of reproductive problems, infectious diseases and congenital defects are valuable animals for milk production. Thus, this culling imposes a very high expense on the farmer, and similar results have been reported (Allaire et al 1977;Weigel 2004;SahebHonar et al 2010). The estimates of variance components and corresponding genetic parameters are presented in Table 7.…”

Section: Resultssupporting

confidence: 76%

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Analysis of culling records and estimation of genetic parameters for longevity and some production traits in Holstein dairy cattle

Ghaderi–Zefrehei

Rabbanikhah

Baneh

et al. 2016

Journal of Applied Animal Research

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We used data collected on 48,739 cows from 1982 to 2013 from Foka farm in the Isfahan province of Iran to assess the reasons for culling in Iranian Holstein dairy cattle in the context of breeding values of economic traits, and also to study the relationship between longevity and production traits. Estimation of (co)variance components and genetic parameters for studied traits including MY, FY, herd life (HL) and length of production life (LPL) was by AI-REML algorithm in WOMBAT software. The results showed that 27.11% of cows were culled voluntarily under the farmers' command. The number and reasons for culling animals varied considerably over the years. Also, the results showed that involuntarily culled animals were valuable with significantly higher breeding values for MY and FY (P < .0001) than those of voluntarily culled individuals. The estimates of heritability for longevity traits (HL and LPL) were low (0.11 and 0.09), but their genetic correlation with production traits were high and positive (0.63-0.70). Our results suggest that some opportunity may exist for genetic improvements in fat and milk yield in Iranian Holsteins. ARTICLE HISTORY

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 76%

Analysis of culling records and estimation of genetic parameters for longevity and some production traits in Holstein dairy cattle

Ghaderi–Zefrehei

Rabbanikhah

Baneh

et al. 2016

Journal of Applied Animal Research

View full text Add to dashboard Cite

show abstract

“…Thus, the model had a class for cows with unknown inbreeding (f*) and a class for cows with 0 inbreeding (f0). Five other classes (fi) were for cows with inbreeding coefficients (F) in the ranges 0 < F < 5%, 5 <~ F < 10%, 10 ~< F< 15%, 15 [2] where superscript o indicates solutions to the mixed model equations. Procedures for estimating standard errors of estimates in both models [2] and [3] are in the appendix.…”

Section: Modelmentioning

confidence: 99%

“…As presented, models [2] and [3] ignore the different residual variances for cows with different inbreeding coefficients. For a noninbred cow with noninbred sire and MGS, the residual variance is:…”

Section: Modelmentioning

confidence: 99%

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Effects of Inbreeding on Milk and Fat Production, Stayability, and Calving Interval of Registered Ayrshire Cattle in the Northeastern United States

Hudson¹,

Vleck²

1984

Journal of Dairy Science

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Inbreeding coefficients of 30,794 registered Ayrshire cows were calculated from relationships between sire and maternal male ancestors. Average inbreeding coefficient of all cows was less than 1% and of the 5,202 inbred cows was 5.4%. Fewer than 2% of inbred cows had coefficients greater than 15%. Percent of inbred cows increased from 23% of cows born in 1972 to 43% in 1980. Over the same period average inbreeding coefficient of all cows increased from 1.2 to 2.0%, but average coefficient of inbred cows decreased from 5.6 to 4.7%.Effects of inbreeding on first lactation, 305-day, 2x, mature equivalent milk and fat production (kg), 48-mo stayability (proportion of cows surviving to 48 mo of age), and first calving interval (days) were estimated by a model that included fixed effects for herd-year-seasons, sirematernal grandsire groups, inbreeding, and random effects for sires and maternal grandsires within groups. Inbreeding was included in the model as a classification (six classes according to inbreeding coefficient: 0, 0 + to 5-%, 5 to 10-%, 10 to 15-%, 15 to 25-%, and 25 to 35-% and one class for cows with indeterminate inbreeding). Estimates of differences between inbreeding classes 0 + to 5-% through 25 to 35-% and the zero inbreeding class indicated that milk and fat production decreased with increased inbreeding. Effects of inbreeding on stayability and calving interval were small. Inbreeding was fitted also as a linear covariate. Regressions of milk, fat,

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An empirical model of asset replacement in dairy production

Miranda¹,

Schnitkey²

1995

J. Appl. Econ.

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Throughout the US dairy farm industry, observed rates of dairy cow replacement consistently exceed the rates prescribed as optimal by dairy economists. We attempt to uncover the causes of this discrepancy by estimating a series of dynamic discrete choice models of dairy cow replacement using historical farm‐level data. We also advance the methods used to estimate dynamic discrete choice models by demonstrating how orthogonal polynomial projection methods can be effectively combined with standard maximum likelihood techniques to estimate structural models of dynamic decision making.

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Variations in Removal Reasons and Culling Rates with Age for Dairy Females

Cited by 69 publications

References 10 publications

Analysis of culling records and estimation of genetic parameters for longevity and some production traits in Holstein dairy cattle

Analysis of culling records and estimation of genetic parameters for longevity and some production traits in Holstein dairy cattle

Effects of Inbreeding on Milk and Fat Production, Stayability, and Calving Interval of Registered Ayrshire Cattle in the Northeastern United States

An empirical model of asset replacement in dairy production

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