+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Effect of herdsize on phenotypic variances for mature equivalent milk of first lactation cows

Effect of herdsize on phenotypic variances for mature equivalent milk of first lactation cows

Journal of Dairy Science 75(Supplement 1): 245

In genetic evaluations genetic variance is standardized based on phenotypic variance. Currently, within-herd variances are regressed toward regional means. Herd size was studied as a predictor of phenotypic variance. Phenotypic variances were computed for mature-equivalent milk using data from 600 000 1st-lactation cows calving in 1990. Herd sizes varied from 10 to 1067 1st-lactation cows. Variance tended to increase with herd size. S.d. ranged from 1377 to 1781 kg.

(PDF 0-2 workdays service: $29.90)

Accession: 002356514

Download citation: RISBibTeXText

Related references

Effect of herd size on phenotypic variances for me milk of first lactation cows. Journal of Dairy Science 75(SUPPL 1): 245, 1992

Sodium salicylate treatment in early lactation increases whole-lactation milk and milk fat yield in mature dairy cows. Journal of Dairy Science 96(12): 7709-7718, 2015

Estimates of variances for first lactation milk and fat yields of Holstein cows in the US and Brazil. Journal of Dairy Science 81(SUPPL 1): 64, 1998

Mature equivalent age adjustment factors for lactation milk yield in Indian buffaloes. Buffalo Bulletin 13(2): 44-46, 1994

Mature equivalent age adjustment factors for lactation milk yield in Haryana cattle. Journal of Research, Assam Agricultural University 1985; 4(1): 24-30, 1983

Estimates using an animal model of (co)variances for yields of milk, fat, and protein for the first lactation of Holstein cows in California and New York. Journal of Dairy Science 78(7): 1591-1596, 1995

A note on phenotypic correlations among lactation persistency, 30-day part lactation yield and total milk yield in Tharparkar cows. Indian Journal of Animal Health 29(1): 87-90, 1990

Investigation of the possibility of adjusting milk production of cows of Black and White breeds to a mature cow equivalent. 1977

Effect of lactation number, year, and season of initiation of lactation on milk yield of cows hormonally induced into lactation and treated with recombinant bovine somatotropin. Journal of Dairy Science 94(9): 4524-4530, 2011

Investigations on the effect of stage of lactation on the content of some constituents in cows' milk. IV. Effect of stage of lactation on the relative proportions of different milk proteins in relation to beta -lactoglobulin and kappa -casein genotypes. Prace i Matialy Zootechniczne, Instytut Genetyki i Hodowli Zwierzat Polskiej Akademii Nauk (2): 31-58, 1973

Change in body condition score of Holstein cows as affected by parity and mature equivalent milk yield. Journal of Dairy Science 79(6): 1009-1015, 1996

Phenotypic aspects of milk yield and lactation length of crossbred and graded holstein cows. Arquivo Brasileiro de Medicina Veterinaria e Zootecnia 41(6): 465-476, 1989

Estimates of phenotypic and environmental parameters of milk production at the control day and 305 days of lactation in Gir breed cows. Ciencia e Agrotecnologia 27(4): 921-926, 2003

Genetic and phenotypic relationships between lactation cell counts and milk yield and composition of Holstein cows. Journal of Dairy Science 68(5): 1250-1256, 1985