Milk Yield:

 The milk manufacturing of a dairy cow is characterized via lactation manufacturing, that's calculated from every day milk yields (DMY) at some point of lactation. The DMY is calculated from one or extra milking a day collected at the farm. There is, at present, no breed or pressure of yak developed in particular for milk manufacturing. All breeds are kept, to a greater or lesser extent, to supply milk, similarly to their different makes use of and products. Milk yield is closely associated with pasture boom and first-rate and, in wellknown terms, the amount of milk produced via the yak cow is taken into consideration as no extra than the amount wanted for the normal increase and development of its calf. In this respect, the milk yield of yak is more similar to that of animals in the wild than to the milk yield of dairy livestock. Even although the milk can be taken from the yak cows on the fee of the calf, milk and milk products of yak are crucial for the herdsmen and their families, in China and in maximum other yak-maintaining countries. In business terms, milk is perhaps the maximum crucial of the yak products. The F1 hybrids with different cattle produce substantially extra milk than the natural yak - the actual amount depending on the cattle breed used to supply the hybrid. The F1 hybrid has, therefore, enormous price to the herdsmen in the right situation. Lactation milk yield will increase with the age of the female up to approximately 10 or eleven years antique and also with the quantity of calvings (Zhang Rongchang et al., 1983; Xu Guilin et al., 1983) - despite the fact that these two elements are rather closely associated with each other. Figure 6.3 indicates seasonal modifications in yield in six special lactations

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