[en] The study was conducted at the Rukoko station located at 21 km North-Western of Bujumbura in the Imbo natural region, in the South of Rusizi River. The objective was to assess the effects of year of lactation, genetic group, lactation length, season and parity on the Daily Milk Yield (DMY) of Jersey (J) x Sahiwal (S) x Ankole (A) crossed cows. Milk yields were obtained from cows that have been both Suckled and Milked (SM) or only Milked (M). Data were analyzed using the procedure GLM in SAS on SM and M cows, separately. All factors affected significantly DMY (p<0.001). A significant increase was observed from 1989-1991 due to the improvement of management techniques. During this period, the production raised from 10.07 +/- 0.22 L-11.50 +/- 0.17 L day(-1) for SM cows. Unfortunately, the 1993 civilian war destabilized the managerial techniques and consequently, the milk production decreased. Highest milk yields were observed in crossed cows with 50% of Jersey and 50% of Sahiwal inheritances. Peak yields occurred at the 43rd (12.67 +/- 0.42 L) and 56th (6.42 +/- 0.45 L) days in milk for SM and M cows, respectively. Milk production was significantly higher in January (11.04 +/- 0.23 L day(-1)), in the middle of the rainy season, than in July (7.02 +/- 0.18 L day(-1)), in the middle of the dry season. Milk yield in SM cows increased from 8.15 +/- 0.17 L-9.46 +/- 0.16 L day(-1) during the 1st and the 2nd lactation, respectively.
Disciplines :
Animal production & animal husbandry
Author, co-author :
Hatungumukama, G.
Hornick, Jean-Luc ; Université de Liège - ULiège > Département des sciences cliniques > Labo de biologie des tumeurs et du développement
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