Artificial insemination of diary cows with prolonged service period with use of native bull semen during summer period.

摘要: It was noticed that during summer period cows on all farms and in both breeding system (tied or free stall) have problems with fertility. This low fertilityin this affects fertility of the herd necessary pregnancy rate 82% yearly can not be achieved. During these months bulls reproduction centres also produce ejaculates couldn't frozen sperm is less fertile. has considerably big effect overall June, July August PKB Corporation every year. In besides endometritis other paragenetic factors, primarily nutrition lead to prolongation service high insemination index cows. cases when 20 % are affected prolonged for over 150 days. Because we’ve decided inseminate (over 4 more insemination), through farm Lespusnica, Corporation, fresh diluted equilibrated semen from centre. Control done by microscope before each use. Semen used up 72 hours after collecting (preparation), andromed kept temperature 5oC. Comparation inseminated diluetd same deep originating following plan programme a farm.