DETERMINATION THE EFFECTS OF VARYING LEVELS OF WHOLE COTTONSEED ON GOSSYPOL PLASMA AND PRODUCTION PARAMETERS IN EARLY LACTATING HOLSTEIN COWS
Morteza Salehpour, Mohsen Hajipour
A study was carried out to determine the effects of varying levels of whole cottonseed on gossypol plasma and production parameters in early lactating Holstein cows. Sixteen early lactating Holstein cows (DIM=39±5) were used in Latin Square design with 4 block and 4 repeats. Animals in each group fed 1 of 4 experimental ration containing (0, 7, 14 and 21 % Whole cottonseed on dry matter base).The diets were similar as crude protein and NEL on dry basis. Cows were fed with total mixed ration individually. Plasma Gossypol measurement was shown that diets were significant different (P<0.05), so that Plasma gossypol was higher for cows fed high whole cottonseed (14 and 20 % whole cottonseed) diets. Plasma gossypol of cows fed whole cottonseed were shown negative effects on milk fat and protein percentage and yields, but no effects on Dry matter intake and Milk production.
Key words: Early lactation, Holstein cows, Whole cottonseed, plasma gossypol, animal performance