Genetic and non-genetic factors influencing Ostertagia ostertagi antibodies in UK Holstein Friesian cattle

Hayhurst, C.; Bradley, A. J.; Hunter, K.; Forbes, Andrew Benjamin; Royal, Melissa

doi:10.1017/s2040470010001470

Cited by 1 publication

(1 citation statement)

References 6 publications

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“…1). These results are in agreement with those reported by Hatungumukana et al (2007); Petrović et al (2009), Sun et al (2009Bormann and Wilson (2010) and Hayhurst et al (2010). The majority of the cows in this study had calving intervals between 380 and 400 days.…”

Section: Effect Of Calving Intervalsupporting

confidence: 93%

Environmental factors affecting milk, fat and protein yields in Jersey cattle in Zimbabwe

Missanjo¹,

Imbayarwo-Chikosi

Halimani

2010

Trop Anim Health Prod

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A study was carried out to establish the factors affecting milk, butterfat and protein yields in Zimbabwean Jersey cattle. A total of 10,986 unedited 305-day lactation records were obtained from Zimbabwe Livestock Identification Trust containing 25 herds, with cows calving in the period 1996-2008. The general linear model procedure of the Statistical Analysis Systems version 9.1.3 was used to determine the environmental factors. Herd-year-season, calving interval, days dry and both the linear and quadratic effects of age at calving fitted as covariates significantly (P<0.0001) affected the milk, fat and protein yields. Herd-year-season accounted for 36%, 36% and 35% to the total variation in milk, fat and protein yields, respectively. Milk, fat and protein yields increased with an increase in calving interval. The optimum dry period for milk, fat and protein yields obtained was 60-75 days dry. The relationship between the production traits and age at calving was both linear and quadratic, implying that milk, fat and protein yields increase with the age of the animal. It is thus necessary to preadjust data for these environmental factors when carrying out genetic evaluations of production traits in dairy cattle.

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