Factors affecting calving intervals, extracted milk yield and lactation length of Teso cattle and their crosses with Sahiwal and Boran

Abstract

The current study was aimed at evaluating factors that influence reproductive performance and extracted milk yield of Teso (T) cattle and their crosses with Sahiwal (S) and Boran (B) using data collected between 2000 and 2002. We used General Linear Models procedure of SAS for analysis. The overall mean calving interval was 453±1.06 days and that of F1(BxT) and F1(SxT) crosses were 44.6 and 61.3 days longer than the pure Teso cows. The overall means for extracted lactation milk yield and lactation length were 120+-3.4 litres and 173.6+_5.0 days, respectively. F1(SxT) crosses had longer lactation length than F1(BxT) crosses and pure Teso cows by 34.2 and 17.2 days, respectively. F1(SxT) crosses had significantly (p 0.05) difference in extracted milk yield was observed between F1(BxT) crosses and purebred Teso cattle. Cows calving in the dry season had higher (p Keywords : calving interval, extracted lactation milk yield, 100-days milk yield, lactation length Tanzania Vet Journal Vol. 25 (2) 2008: pp. 96-105