An Investigation of the Inheritance of Female Reproductive Performance and Longevity, and their Interrelationships within a Holstein-Friesian Herd

Wilcox, C.J.; Pfau, K.O.; Bartlett, John

doi:10.3168/jds.s0022-0302(57)94578-2

Cited by 40 publications

(29 citation statements)

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“…The result that the phenotypic correlation is larger than the genetic correlation between milk production and survival suggests that high producing cows survive longer largely due to nongenetic factors, one of which is the fact that high producers may be given more chance for survival. Genetic and phenotypic correlations between first CI and survival are not significantly different from zero in agreement with Wilcox et al (29).…”

Section: Estimation Of Relationships Among Milk Yield Survival and supporting

confidence: 78%

Estimates of Genetic and Environmental (Co)Variances for First Lactation Milk Yield, Survival, and Calving Interval

Dong

Vleck

1989

Journal of Dairy Science

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Variance and covariance components for milk yield, survival to second freshening, and calving interval in first lactation were estimated by REML with the expectation and maximization algorithm for an animal model which included herdyear-season effects. Cows without calving interval but with milk yield were included. Each of the four data sets of 15 herds included about 3000 Holstein cows. Relationships across herds were ignored to enable inversion of the coefficient matrix of mixed model equations. Quadratics and their expectations were accumulated herd by herd. Heritability of milk yield (.32) agrees with reports by same methods. Heritabilities of survival (.11) and calving interval (.15) are slightly larger and genetic correlations smaller than results from different methods of estimation. Genetic correlation between milk yield and calving interval (.09) indicates genetic ability to produce more milk is slightly associated with decreased fertility.

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Section: Estimation Of Relationships Among Milk Yield Survival and supporting

confidence: 78%

Estimates of Genetic and Environmental (Co)Variances for First Lactation Milk Yield, Survival, and Calving Interval

Dong

Vleck

1989

Journal of Dairy Science

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“…Ducrocq et al (1988) suggest that nonlinear approaches may have a better ability to detect genetic variation in binary reproductive traits than linear methods. Genetic variation has been detected by linear models for the breeding efficiency traits proposed by Wilcox et al (1957) and Tomar (1965).…”

Section: Productive Life and Reproductive Efficiency Traits In Nellorementioning

confidence: 99%

“…The estimate of LP by Martinez et al (2004) was 3.72 ± 2.07 calves born in 6 years after first calving. LPL = length of productive life; LP = life production defined as total number of calves; BEW = breeding efficiency on original scale estimated using the Wilcox et al (1957) function; BET = breeding efficiency on original scale estimated using the Tomar (1965) function; ASBEW = breeding efficiency transformed scale using the Wilcox et al (1957); ASBET = breeding efficiency transformed scale using the Tomar (1965). Estimates of heritability for measures of LPL and LP were low and ranged from 0.04 to 0.05.…”

Section: Statistical Analysesmentioning

confidence: 99%

“…Wilcox et al (1957) and Tomar (1965) functions are described below, (Wilcox et al, 1957) where, 335 = ideal calving intervals; n = total number of calvings; D = number of days from first calving until last calving, given that stay up to 6 years old (72 months) in the herd. (Tomar, 1965) where, n = number of calving intervals; 945 = ideal age at first calving, in days; AFC = real AFC, in days; SCI = real sum of calving intervals, in days.…”

Section: Traits Analyzedmentioning

confidence: 99%

“…Four traits were used to describe reproductive efficiency traits: two breeding efficiencies on original scale were estimated using Wilcox et al (1957) and Tomar (1965) functions (BEW and BET), and two breeding efficiencies transformed (ASBEW and ASBET) using the function [arcsine (square root (BEi/100))]. Wilcox et al (1957) and Tomar (1965) functions are described below, (Wilcox et al, 1957) where, 335 = ideal calving intervals; n = total number of calvings; D = number of days from first calving until last calving, given that stay up to 6 years old (72 months) in the herd.…”

Section: Traits Analyzedmentioning

confidence: 99%

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Genetic parameters for productive life traits and reproductive efficiency traits at 6 years in Nellore cattle

Balieiro¹,

Eler²,

Ferraz³

et al. 2008

Genet. Mol. Res.

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ABStrACt. The objective of the present study was to estimate (co)variance components for length of productive life (LPL) and some alternative reproductive traits of 6-year-old Nellore cattle. The data set contained 57,410 records for age at first calving from Nellore females and was edited to remove animal records with uncertain paternity and cows with just one piece of calving information. Only animals with age at first calving ranging from 23 to 48 months and calving intervals between 11 and 24 months were kept for analysis. LPL and life production (LP) were used to describe productive life. LPL was defined as the number of months a cow was kept in the herd until she was 6 years old, given that she was alive at first calving and LP was defined as total number of calves in that time. Four traits were used to describe reproductive traits: two breeding efficiencies on original scale were estimated using Wilcox and Tomar functions (BEW and BET, respectively), and two breeding efficiencies transformed (ASBEW and ASBET, respectively), using the function [arcsine (square root (BEi/100))]. Estimates of heritability for measures of LPL and LP were low and ranged from 0.04 to 0.05. Estimates of heritability for breeding efficiencies on original and transformed

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Performance and heterosis from crossing local cattle in the Sudan

1991

Trop Anim Health Prod

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Local Sudanese breeds were crossbred at Ghazala Gawazat Research Station in western Sudan to utilise the advantage of heterosis. The breeds involved were Kenana (KK), Butana (BB), and Western (WW). Lactation milk yields were 277.7 and 252 kg/210 days from two teats for BB and WW respectively. Offspring from BB and KK sires bred to WW dams had 8.5% and 25% higher lactation milk yield respectively, than straightbred WW cows. The percentage heterosis for total milk yield was 3.3. The reproductive effectiveness of all breed types was below 100%; indicating that most cows did not calve at regular intervals of 365 days. The local crosses (Butana x Western [BW]) had an earlier age at first calving and shorter calving interval, by 46 and 17% respectively below their respective straightbreds. Weaning weights (205-day) were 66.4, 58.5, 69.5 and 64.8 kg for BB, WW, BW and KW, respectively. The estimated heterosis for weaning weight was 10.1 per cent.

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An Investigation of the Inheritance of Female Reproductive Performance and Longevity, and their Interrelationships within a Holstein-Friesian Herd

Cited by 40 publications

References 4 publications

Estimates of Genetic and Environmental (Co)Variances for First Lactation Milk Yield, Survival, and Calving Interval

Estimates of Genetic and Environmental (Co)Variances for First Lactation Milk Yield, Survival, and Calving Interval

Genetic parameters for productive life traits and reproductive efficiency traits at 6 years in Nellore cattle

Performance and heterosis from crossing local cattle in the Sudan

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