Investigation of Non-Genetics Factors Affecting Milk-Fat Content and Milk-Fat Percentage Curves' Parameters In Azeri and Khuzestani Buffalo Breeds

The study of milk production and composition curves in buffalo provides key pieces of information about genetic potentials and management-related strategy to both breeders and farmers. The objective of this study was to identify of the non-genetic factors of parameters for fitted Wood function on milk fat content (MFC) and milk fat percentage (MFP) curve of Azari and Khuzestan buffalo. The data were collected from 15065 and 15225 from Khozatani buffalo and 9571 and 9721 lactation period of Azari buffalo on MFC and MFP were used for further analyses. For the first phase, the Wood function for each individual within the investigated population was fitted. Then, environmental factors affected MFC and MFP in both populations were assessed. In the last step, after the estimation of curve parameters, the phenotypic correlation for both populations was estimated. Results of the present study showed the MFP of Khuzestan breed was almost % 0.5 lower than Azari breed and faster reached to the lowest point within MFP curve shape. Furthermore, because of the higher milk production rate of Khuzestan breed, the MFC of this breed showed almost % 25 higher at the peak,  compared to the Azari buffalo. Also, due to higher observation of daily milk production in Khuzestan buffalo, this breed has good potential to produce more daily MFC and less MFP than Azari. Finally, the outputs of the report this research may be effective in help to improving nutritional the feeding formulation and genetics programs of Iranian buffaloes.