Association of AM-PM Milk Records with Daily Milk Traits in Gir Cows
DOI:
https://doi.org/10.48165/ijvsbt.21.1.13Keywords:
AM-PM milking, Gir cows, Milk composition, Milk yield, SCCAbstract
Present study evaluated association of morning (AM) and afternoon (PM) milk records with 24 h daily milk traits (milk yields, composition and somatic cells) in Gir cows (n=50). Milk yield, composition and somatic cell count (SCC) were recorded at fortnightly interval. The milk yield did not differ at AM and PM milking sessions, while fat corrected milk yield was significantly (p=0.021) higher at PM than AM milking session. The AM milk had significantly lower fat content (p=0.034), but higher protein (p=0.032), lactose (p=0.011), ash (p=0.004) and solid-not-fat (p=0.009) content than PM milk. Milk total solids content and SCC of AM and PM milk did not differ significantly. All the AM-PM milk traits showed positive and significant (p<0.001) correlation with daily milk traits. Linear regression equations for prediction of daily milk traits from AM-PM milk records revealed that values of coefficient of determination (R2) ranged from 0.51 to 0.77 and from 0.48 to 0.86 at AM and PM milking sessions, respectively. Among different milk traits, PM milk yield was more accurate (86%) to predict daily yield. Taken together it is concluded that daily milk traits of Gir cows particularly milk yield can be predicted from afternoon yield with higher accuracy.Downloads
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