|Title||Post-partum anestrus and fall pregnancy in 2-year-old range cows supplemented with protein and fat|
|Publication Type||Conference Proceedings|
|Year of Publication||1995|
|Authors||Gambill D.M., Petersen M.K., Hawkins D.E., Luna I.T., Corona J.S.S., Dunlap D., Havstad K|
|Conference Name||Proceedings of the Western Section Meeting, American Society of Animal Science|
|Keywords||beef cows, reproduction|
The objectives of this study were to determine the effect of supplements containing 50% bypass protein with and without 10% fat on rebreeding performance of two year old range cows. Sixty-three black Angus x Hereford cows with nursing calves at the USDA Jornada Experimental Range were divided by calving date and sex of calf into one of three pastures. Cows received either a 20% crude protein supplement (20%S), 48 % crude protein supplement (which was 50% bypass protein) (48%S) or 48%S with 10% added fat (in the form of Alifet) (48%S+F) from calving until breeding (February to May). Cattle were weighed before calving, before exposure to bulls and again at weaning. Serum samples were collected twice before (10 d intervals) breeding to determine percentage of cows that had cycled prior initiating the breeding season.