Influence of the lactation number on the lactation milk yield in holstein cattle
1991
Preeyapan Udomprasert (Kasetsart Univ. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Veterinary Medicine. Dept. of Obstetrics and Gynaecology) | Peerasak Chantaraprateep | Udom Vangtal
Lactation number (LACNO) exerts a significant impact on the lactation milk yield (YIELD). Cows in lactation 4 are likely to produce 29 percent more milk than those in lactation 1. The linear relationship between the two variables can be expressed mathematically as YIELD=3087.8+(331.8*LACTNO) (P=0.012, R2=0.099). Premature culling of the cows before reaching lactation number 4 would result in an average loss of 331 Kilograms of milk per lactation. An efficient dairy herd may not only achieve the 365-390 days average of calving to calving interval but also limit the culling rate within 25 percent of the milking herd size. At this rate of culling, the herd average lactation number will be swinging around 4 (100/25).
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