Estimation Of 305-day Yield From Total Milk Yields In Bunaji And Friesian-bunaji Crosses

Auteurs

  • A. E. O. Malau-aduli Ahmadu Bello University, P.M.B. 1096, Shika-Zaria.
  • B. Y. Abubakar Ahmadu Bello University, P.M.B. 1096, Shika-Zaria.

DOI :

https://doi.org/10.51791/njap.v19i.2093

Mots-clés :

Total milk yield, 305-day yield, Regression equations, Multiplicative factors, Bunaji, Friesian-Bunaji crosses.

Résumé

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 fronı TY and to develop estimation factors. The linear regression equations for 

Estimating  305-day yield from TY are Y = 1895.229 + 0.804 TY (R2 = 0.971) and Y = 366.176 + 0.775 TY (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.

Bibliographies de l'auteur

A. E. O. Malau-aduli, Ahmadu Bello University, P.M.B. 1096, Shika-Zaria.

National Animal Production Research Institute, 

B. Y. Abubakar, Ahmadu Bello University, P.M.B. 1096, Shika-Zaria.

National Animal Production Research Institute, 

Téléchargements

Publiée

2021-01-16

Comment citer

Malau-aduli, A. E. O. ., & Abubakar, B. Y. . (2021). Estimation Of 305-day Yield From Total Milk Yields In Bunaji And Friesian-bunaji Crosses. Nigerian Journal of Animal Production, 19, 141–145. https://doi.org/10.51791/njap.v19i.2093

Numéro

Vol. 19 (1992)

Rubrique

Articles

Articles les plus lus par le même auteur ou la même autrice