Accuracy of test interval method in estimating total milk yield and milk components of dairy goats [manuscript]
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Date
2017
Authors
Raniel A. Valencia
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Abstract
The study sought to assess the accuracy of test interval method (TIM) in estimating totl milk yield and milk components of dairy goats. The TIM was used to estimate the milk yield of 31 dairy goats (2 Saanen, 7 Toggenburg, 1 Alpine, 21 Anglo-Nubian) from Small Ruminant Center, Central Luzon State University, Science City of Muñoz, Nueva Ecija. Three Anglo-Nubian were used in the estimation of milk components. Test interval was at 15, 20 and 30 days. The study period covered 150 days lactation starting from 5th day after kidding. Results revealed that the estimates of test interval method were lower compared to the actual milk yield. The mean for the actual milk yield was 4.08% to 5.85% higher than the three tested interval. However, 20 days interval has the highest accuracy (95.92%) on estimating milk yield. Meanwhile, 15 days interval has the highest accuracy for milk components estimate, namely; 96.83% for milk fat, 96.11% for milk protein, 95.22% for total solid and 95.56% for solid nonfat. Correlations between the actual and estimated yield of TIM were 0.983, 0.977 and 0.955 for 20 days, 15 days, and 30 days interval, respectively for milk yield. For milk fat, the r-values were 0.980, 0.842, and 0.765 for 20 days, 30 days and 15 days interval, respectively. In terms of milk protein, the r-values were 0.989, 0.989 and 0.871 for 15 days, 20 days, and 30 days interval, respectively. Test interval method could be an alternative recording method in estimating total milk yield and milk components of dairy goats.