Observations on the lactation performance of cross-bred dairy cattle on the Centeno Livestock Station
1988
Hosein, A.A. | Suepaul, M. | Nurse, L. | Ramlal, H. (Ministry of Food Production, Marine Exploitation, Forestry and the Environment, Centeno (Trinidad and Tobago))
One hundred and five lactations of 48 crossbred dairy cows were monitored for the first three lactations. 41 (85.4 %) of the animals had completed a second lactation, while 16 (33.3 %) completed their third lactation. For the 105 lactations, the mean lactation yield was 1306 850.7 kg in 192.0 79.4 days. 13(12.4 %) lactations were between 0 and 100 days, 41 (39.0 %) were between 101 and 200 days while 48(45.7 %) lactations were over 200 days. Mean lactation yields of 1068.3 772.3, 1662.7 918.4 and 1442 581.9 kg were observed for lactations 1, 2 and 3 respectively. The efficiency of production as indicated by production (kg) per head per day in lactation was 5.9 2.1, 7.3 +-2.1 and 6.8 +- 2.0. With each period the variations in lactation length and yield were 36, 17 and 14 % respectively and 80, 38 and 30 % respectively. Mean lactation lengths of 166.6 85.3, 215.2 +- 74.2, and 208.9 +- 49.0 days, were recorded for lactations 1, 2 and 3 respectively. Observations of the variation in lactation length, yield and efficiency of production indicated that variation was highest for lactations that lasted for between 0-100 days
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