For best performance a frame score of six to seven is most desirable at twelve months. Maintenance in the bull. Top line and heart girth should be the same or girth larger. The large girth provides for more efficient, adaptable and vigorous animal. The bull with a deep chest will have a thick hide which provides for a healthier animal more blood flow through hide, cooler in summer and warmer in winter, less fly's and ticks also the extra health provides for less internal parasites.
Insufficient girth allows front feet to toe out is more susceptible to stress.
Breeding for size requires out crossing. Breeding for size is single trait selection. Breeding for large size has decreased performance in the cattle herd in every area of production. Breeding for large size has also decreased the amount of intramuscular fat in the cattle herds. Intramuscular fat provides for quality of taste and palatability.