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Estimation of 305-day yield from total milk yields in Bunaji and Friesian-Bunaji crosses
Malau-Aduli, AEO and Abubakar, BY (1992) Estimation of 305-day yield from total milk yields in Bunaji and Friesian-Bunaji crosses. Nigerian Journal of Animal Production, 19 (2). pp. 141-145. ISSN 0331-2064
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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 TY are: Y = 1895.229 + 0.804TY (R2 = 0.971) and Y = 366.176 + 0.775TY (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.
|Keywords:||Total milk yield, 305-day milk yield, regression equations, multiplicative factors, Bunaji, Friesian-Bunaji crosses|
|Journal or Publication Title:||Nigerian Journal of Animal Production|
|Page Range:||pp. 141-145|
|Date Deposited:||16 Jun 2009 04:18|
|Last Modified:||18 Nov 2014 04:00|
|Item Statistics:||View statistics for this item|
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