Estimated Breeding Values of Beef Sires Can Predict Performance of Beef-Cross-Dairy Progeny

Natalia Martín; Lucy Coleman; Nicolás López-Villalobos; Nicola Schreurs; Stephen Morris; Hugh Blair; Julie McDade; Penny Back; Rebecca Hickson

doi:10.3389/fgene.2021.712715

Estimated Breeding Values of Beef Sires Can Predict Performance of Beef-Cross-Dairy Progeny

Front Genet. 2021 Sep 30:12:712715. doi: 10.3389/fgene.2021.712715. eCollection 2021.

Authors

Natalia Martín¹, Lucy Coleman¹, Nicolás López-Villalobos¹, Nicola Schreurs¹, Stephen Morris¹, Hugh Blair¹, Julie McDade², Penny Back¹, Rebecca Hickson¹

Affiliations

¹ School of Agriculture and Environment, Massey University, Palmerston North, New Zealand.
² Greenlea Premier Meats Ltd., Hamilton, New Zealand.

Abstract

On average, half of the animal's estimated breeding value (EBV) is passed on to their progeny. However, it is not known how the performance of beef-cross-dairy cattle relates to the EBV of their beef sire. Such information is required to determine the genetic potential of beef sires selected based on existing EBV to be used on dairy cows in New Zealand. This study evaluated the relationship between the EBV of 30 Angus and 34 Hereford sires and the performance of their progeny for birth, growth, and carcass traits, via progeny testing of 975 beef-cross-dairy offspring born to dairy cows and grown on hill country pasture. Overall, BREEDPLAN EBV did predict progeny performance of the beef-cross-dairy cattle from this study. Gestation length and birthweight increased with increasing sire EBV (mean 0.37-0.62days and 0.52-0.64kg, respectively, p<0.05). Age at weaning decreased with increasing sire EBV for liveweight at 200days (0.17-0.21days per extra kilo of sire EBV, p<0.05) but sire EBV for liveweight at 200days had no effect on the liveweight of the progeny at 200days for either breed (p>0.05). Liveweight increased with sire EBV for liveweight at 400, 600, and 800days, by a similar amount for both breeds (between 0.23 and 0.42kg increase in progeny liveweight per extra kilo of sire EBV, p<0.05). The relationships were more inconsistent for carcass traits. For Hereford, carcass weight and eye muscle area increased with increasing sire EBV (0.27kg and 0.70cm², respectively, p<0.05). For Angus, marble score increased by 0.10 with 1% extra in sire EBV for intramuscular fat (p<0.05). Rib fat depth tended to increase with sire EBV for both breeds (p<0.1). EBV derived from beef-breed data work in dairy-beef systems but maybe slightly less than the expected 0.5units of performance per unit of EBV. New Zealand farmers should consider BREEDPLAN EBV when selecting sires to mate dairy cows or when buying beef-cross-dairy calves for beef production, to ensure the resulting calves are born safely and on time and then grow well to produce carcasses of suitable meat and fat composition.

Keywords: beef-on-dairy; carcass; crossbreeding; dairy-beef; genetic evaluation; gestation length; liveweight; progeny test.