Effectiveness of Model for Cow Evaluation Intraherd

Schaeffer, L.R.

doi:10.3168/jds.s0022-0302(83)81870-0

Cited by 16 publications

(9 citation statements)

References 8 publications

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“…Within a sire model, it is assumed that all dams are of similar genetic merit and this can result in bias in the predicted breeding values if there is preferential mating (Mrode, 2005). Everett et al (1979) and Schaeffer (1983) showed that including the maternal grandsire of the animal could reduce bias compared with the sire model. In this study, a sire-maternal grandsire model was implemented because of limits in computing resources.…”

Section: Discussionmentioning

confidence: 99%

Effect of herd prevalence on heritability estimates of antibody response to Mycobacterium avium subspecies paratuberculosis

Hulzen

Nielen

Koets

et al. 2011

Journal of Dairy Science

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Worldwide, classical control strategies based on hygiene and culling of infected animals have been implemented to eradicate Johne's disease. Breeding for disease resistance may be a useful additional tool to control the disease. The aim of this study was to estimate genetic parameters for the presence of a Mycobacterium avium ssp. paratuberculosis specific antibody response in milk of Dutch Holstein-Friesian cows using subsets of data based on within-herd test prevalence. The analyzed data set consisted of milk samples of 684,364 animals from 12,077 herds collected during the routine milk production scheme. Milk samples were tested for antibodies specific for Johne's disease by an ELISA test. Heritability estimates were calculated for 4 different subsets of data to determine the sensitivity of heritability for within-herd test prevalence. Results expressed as percentage of the sample to positive ratio were analyzed with a sire-maternal grandsire model with fixed effects for parity, year of birth, lactation stage, and herd; a covariate for milk yield at test day; and random effects for sire, maternal grandsire, and error. The estimated heritability ranged from 0.031 for the complete data set to 0.097 for herds with a test prevalence of at least 10%. Cross-validation was applied to determine which of the subsets of data produced the most accurate estimated breeding values. Results showed that for genetic selection to contribute to disease control, breeding values were estimated most accurately from herds with at least 2 animals that tested positive. In this subset the heritability was 0.041.

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Section: Discussionmentioning

confidence: 99%

Effect of herd prevalence on heritability estimates of antibody response to Mycobacterium avium subspecies paratuberculosis

Hulzen

Nielen

Koets

et al. 2011

Journal of Dairy Science

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“…Compared with sire models, animal models are theoretically superior for estimating variance components and breeding values. Several previous studies have reported that animal models provide more accurate predictions than sire models [17–19]. …”

Section: Introductionmentioning

confidence: 99%

Variance components and correlations of female fertility traits in Chinese Holstein population

Lund

Wang

et al. 2017

J Animal Sci Biotechnol

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BackgroundThe objective of the present study was to estimate (co)variance components of female fertility traits in Chinese Holsteins, considering fertility traits in different parities as different traits. Data on 88,647 females with 215,632 records (parities) were collected during 2000 to 2014 from 32 herds in the Sanyuan Lvhe Dairy Cattle Center, Beijing, China. The analyzed female fertility traits included interval from calving to first insemination, interval from first to last insemination, days open, conception rate at first insemination, number of inseminations per conception and non-return rates within 56 days after first insemination.ResultsThe descriptive statistics showed that the average fertility of heifers was superior to that of cows. Moreover, the genetic correlations between the performances of a trait in heifers and in cows were all moderate to high but far from one, which suggested that the performances of a trait in heifers and cows should be considered as different but genetically correlated traits in genetic evaluations. On the other hand, genetic correlations between performances of a trait in different parities of cows were greater than 0.87, with only a few exceptions, but variances were not homogeneous across parities for some traits. The estimated heritabilities of female fertility traits were low; all were below 0.049 (except for interval from calving to first insemination). Additionally, the heritabilities of the heifer interval traits were lower than those of the corresponding cow interval traits. Moreover, the heritabilities of the interval traits were higher than those of the threshold traits when measuring similar fertility functions. In general, estimated genetic correlations between traits were highly consistent with the biological categories of the female fertility traits.ConclusionsInterval from calving to first insemination, interval from first to last insemination and non-return rates within 56 days after first insemination are recommended to be included in the selection index of the Chinese Holstein population. The parameters estimated in the present study will facilitate the development of a genetic evaluation system for female fertility traits to improve the reproduction efficiency of Chinese Holsteins.

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“…been indexed based on ancestral information using regression techniques (Schaeffer 1981 Schaeffer (1983) or Henderson (1975) for Canadian cow evaluation; Henderson (1975) for Canadian dairy sire evaluation; and Dickinson et al (1976) and Powell (1978) For personal use only. For personal use only.…”

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confidence: 99%

Pedigree Indexing Young Holstein Dairy Bulls Using Ancestral Information From Different Countries

Jansen¹,

Schaeffer²,

Burnside³

et al. 1986

Can. J. Anim. Sci.

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Effectiveness of Model for Cow Evaluation Intraherd

Cited by 16 publications

References 8 publications

Effect of herd prevalence on heritability estimates of antibody response to Mycobacterium avium subspecies paratuberculosis

Effect of herd prevalence on heritability estimates of antibody response to Mycobacterium avium subspecies paratuberculosis

Variance components and correlations of female fertility traits in Chinese Holstein population

Pedigree Indexing Young Holstein Dairy Bulls Using Ancestral Information From Different Countries

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