Milk production traits of indigenous Black and Meriz goats raised under farm production system

摘要

To study the milking performance of indigenous goats, a total of 397 test day milk yield observations (TDMY) of 25 Black and Meriz does raised in Farm 1, and 18 local Black does raised in Farm 2 were used. The examined milking performance traits were total milk yield (TMY), peak milk yield (PMY), time to peak milk yield (TPMY) and lactation period (LP). Milk was recorded at monthly intervals starting one month post kidding till the does were dried off. The overall means of TDMY, TMY, PMY, TPMY and LP were 755.84 ± 25.31 ml, 132.38 ± 6.90 L, 1309.56 ± 68.44 ml, 36.52 ± 2.40 days and 172.73 ± 3.83 days, respectively. Within flock Black does yielded significantly (P<0.01) higher TDMY, TMY, PMY and longer LP than did Meriz. Black does raised in Farm 2 yielded significantly (P<0.01) higher TDMY, TMY and PMY compared to those raised in Farm 1. The highest TDMY was attained during the first test and declined significantly (P<0.01) toward the lowest value at the 7th month of lactation. The results revealed that 5 years and older does produced significantly (P<0.01) more TDMY, TMY and PMY than younger does. It can be concluded that a large variations in milk production performance existed between different breeds within the same flocks and between the same breed in different flocks.