Relationship of molecular breeding value for beef tenderness with heifer traits through weaning of their first calf

Polymorphisms in μ-calpain (CAPN1) that beneficially associate with beef tenderness are reported to antagonistically calving day heifers and post-partum interval estrus cows. We, therefore, hypothesized a molecular breeding value for slice shear force, calculated based on CAPN1 calpastatin (CAST) genotypes, would demonstrate an antagonistic relationship between genomically predicted force ordinal date replacement heifers. A secondary objective of this study was evaluate the association polymorphism diacylglycerol O-acyltransferase (DGAT1) reproductive traits One hundred eighty-seven MARC III (¼ Angus, ¼ Hereford, Red Poll, Pinzgauer) had been selectively bred increase frequency these polymorphisms were submitted monthly ultrasound exams beginning at 333 d age continuing until start determine pubertal status. At last exam before breeding, all antral follicles counted, length height each ovary measured if genomic selection associated ovarian follicle number. Calving date, calf gender, birth weight recorded parturition. Regression analysis indicated no prediction (P = 0.16); however, there tendency puberty be delayed as genetic merit improved 0.09). The results present indicate within experimental precision, selecting using predictions minimal or performance Further cows is needed population but applying markers select steers does not antagonize influencing conception first