Possible association between the breeding value of dairy bulls and milk yield of their mates

Taylor, C. S.; Monteiro, Luana Silva; Murray, J. I.; Osmond, T. J.

doi:10.1017/s0003356100036199

Cited by 10 publications

(7 citation statements)

References 9 publications

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“…However, Adkinson et al (1977) reported a much higher estimate of 8-2 to 11 8% variation due to sires. The possible mechanism of sires' effect on dams' production has been explained by Adkinson et al (1977), Taylor et al (1978) and Skjervold (1979). Since placental lactogen has been attributed with the properties of both growth hormone and prolactin in influencing mammary gland growth, the following diagram indicates a possible pathway of how the sire affects its mates' milk production.…”

Section: Discussionmentioning

confidence: 99%

“…The following mathematical model was used to describe the data: Phenotypic correlation between the BV of the sires and the dams' production, with BV repeated for every cow mated to the same sire, was obtained. The regression of the mean mate effect for each sire on the sire's breeding value was also calculated as suggested by Taylor et al (1978).…”

Section: Methodsmentioning

confidence: 99%

“…Recent investigations have also revealed a significant effect of the sire on the mate's milk production in the subsequent lactation (Skjervold and Fimland, 1975;Adkinson, Wilcox and Thatcher, 1977;Taylor, Monteiro, Murray and Osmond, 1978). Hormones produced by the foetal-placental unit seem to be implicated.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the sire on the subsequent lactation performance in the dam

Basu

Tomar

1981

Anim. Sci.

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The effects of 18 buffalo sires, used in 2 years of a progeny-testing programme, on the subsequent lactation performances of their mates, were investigated from a study of 685 lactation records. The traits studied were: milk production, lactation length, length of post partum anoestrus, number of services per conception and length of service period (calving to conception). Parity of calving and sire had a significant effect on 305-day milk yield and lactation length of the mates. Between the 2 years, the sires did not differ for any of the traits of their mates. Although the breeding value of the sires, high or low, did not differ significantly, the sires with high breeding value tended to depress the milk production in the subsequent lactation of their mates and vice versa (r= -005). The birth weight of the calves significantly affected milk production. It was concluded that all methods of sire evaluation are likely to be biased by the effect of sires.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Effect of the sire on the subsequent lactation performance in the dam

Basu

Tomar

1981

Anim. Sci.

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“…Skjervold and Fimland (16) and Adkinson et al (1) reported correlations between effects of sire of cow and sire of fetus of about zero. Taylor et al (17) used a set of data obtained as a by-product of an efficiency of production experiment and found large negative correlations between effects of sire of cow and sire of fetus of -.32 to -.52. Conversion of these estimates to correlations between direct and fetal effects is difficult because some of the correlations involved proofs and others simple averages.…”

Section: Estimation Of Genetic Covariances Between Effects Of Sire Ofmentioning

confidence: 99%

Genetic and Economic Implications of Fetal Effects on the Dam

Vleck

Johnson

1980

Journal of Dairy Science

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The genetic model for fetal effect on production of the dam is described, and studies on genetic and economic implications are reviewed. The effect on production from the sire of the cowhas 1.58 to 3.02 times as much economic value as the effect from the sire of the fetus. The use of mate records in evaluating a sire in addition to daughter records could increase economic gain from selection by 1 to 2% depending on the variation from sire of fetus. Mate records alone do not appear valuable for sire selection. About 1% of the variation in milk yield appears to be due to the effect of sire of fetus as indicated by a summary of various estimates and from consideration of the data and methods used to obtain the estimates. The correlation between effects of sire of fetus and sire of cow appears to be nearly zero. A method of joint evaluation of bulls as sires of cows or as sires of fetuses is described.

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“…The relatively wide range in estimates of components of variance associ~tted with the sire of fetus (SOF) has caused uncertainty as to economic implications of such an effect (13). Endocrine and genetic models for SOF effect have been proposed and discussed (1,8,9,10,11,12). Table 1 presents a brief summary of work on effect of SOF related to lactational milk yield subsequent to parturition.…”

Section: Introductionmentioning

confidence: 99%

Components of Variance Associated with Service Sire for Milk Yield and Reproductive Traits

Johnson

Vleck

1979

Journal of Dairy Science

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The association of service sire or sire of fetus with three milk yield traits and two reproductive intervals were investigated. Two procedures for estimation of variance components, Henderson's Method 1 and Method 3, were applied to a model of herd-year-season, sire of cow, and service sire. Analyses were for sire of calf born to initiate second lactation and service sire of the cow in second lactation. About 11,000 second lactation records on Holstein cows were available after editing for breeding and calving dates. Service sires and sires of cows were required to be in artificial insemination. Estimates by Method 1 for gestation length and days open were 6.0% and -.2% of total variance for sire of calf and 1.0% and 5.4% for service sire in second lactation. Method 1 estimates were consistently larger than Method 3 for milk yield. Variance components expressed as percent of total variance for mature equivalent milk yield in 305 days, 150-day milk yield, and milk yield in remaining days of lactation were 2.7%, 3.1%, and 1.7% for sire of calf and 2.7%, 3.8%, and 1.3% for service sire in second lactation. These same components from Method 3 were .8%, .4%, .8%, and 1.0%, 1.6%, .6%. The differences in estimates may reflect nonrandom use of service sires across herd-year-seasons and sires of cows. About 1% of variance in milk yield was associated with service sires.

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Possible association between the breeding value of dairy bulls and milk yield of their mates

Cited by 10 publications

References 9 publications

Effect of the sire on the subsequent lactation performance in the dam

Effect of the sire on the subsequent lactation performance in the dam

Genetic and Economic Implications of Fetal Effects on the Dam

Components of Variance Associated with Service Sire for Milk Yield and Reproductive Traits

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