Estimation of 305-day yield from total milk yields in Bunaji and Friesian-Bunaji crosses

Malau-Aduli, A.E.O., and Abubakar, B.Y. (1992) Estimation of 305-day yield from total milk yields in Bunaji and Friesian-Bunaji crosses. Nigerian Journal of Animal Production, 19 (1). pp. 141-145.

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Lactation data of 207 cows comprising of 91 Bunaji and 116 Friesian-Bunaji crosses milking for over 305 days were analysed on the basis of average daily yield (ADY), actual 305-day yield (A305), total yield (TY) and lactation length (LL). The objective was to fit a suitable equation that would estimate 305-day yield from TY and to develop estimation factors. The linear regression equations for estimating 305-day yield from TY were Y = 1895.229 + 0.804 TY (R2 = 0.971) and Y = 366.176 + 0.775 IT (R2 = 0.827) for Bunaji and Friesian-Bunaji cows respectively. Various combinations of TY, ADY and LL were used in multiple regressions to estimate 305-day yield with R2 values of over 90%. Factors for the estimation of 305-day yield from cows lactating for periods between 305 to 350 days were developed from the fitted equations.

Item ID: 41068
Item Type: Article (Research - C1)
ISSN: 0331-2062
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Date Deposited: 03 Dec 2015 02:21
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070201 Animal Breeding @ 50%
06 BIOLOGICAL SCIENCES > 0604 Genetics > 060412 Quantitative Genetics (incl Disease and Trait Mapping Genetics) @ 50%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8303 Livestock Raising > 830302 Dairy Cattle @ 100%
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