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Lean and Fat Growth Patterns of Serially Slaughtered Beef Bulls Fed Different Energy Levels¹

North Carolina State University, Raleigh 27695

Abstract

Data collected on 409 bulls were used to evaluate average daily lean and fat growth patterns with respect to slaughter weight, average daily body weight gain and daily energy intake. The research conducted in Denmark represented crossbred and some purebred cattle produced from inseminations of Red Danish and Danish Friesian cows with semen from Angus, Charolais, Gelbvieh, Piedmontese, South Devon, Brown Swiss, Red Belgium, Blue Belgium, Red Danish and Danish Friesian bulls. Bull calves were allotted at 70 d of age to three slaughter weights (320, 440, 560 kg) and three concentrate feeding levels (ad libitum, 85%, 70% of ad libitum). Linear regressions of average daily lean gain and fat gain on slaughter weight and average daily body weight gain or daily energy intake were estimated for all sire breeds. Further analyses attempted to combine the sire breeds into similar breed types. Results show that breed differences in the regression parameters do exist; however, it was impossible with these data to detect statistical significance of specific breed type differences. Generally breed types such as Angus tended to grow slower and were less efficient at high feeding levels in converting energy intake into lean gain than breed types such as Charolais or Piedmontese. Increasing feed intake increased the proportion of fat in gains for all breeds, but the effect was largest for Angus. Results suggest that stocker-grower producers need to consider breed differences in growth composition with respect to available feed resources when making management decisions to improve profit.

¹ Paper No. 10330 of the Journal Series of the North Carolina Agr. Res. Serv., Raleigh 27695-7601. Research was supported in part by USDA-ARS Coop. Agreement No. 58-7B30-2-377.

² Current address: Morehead State Univ., Morehead, KY 40351.

³ Dept. of Anim. Sci.

⁴ Dept. of Econ. and Business.

⁵ Statens Husdyrbrugsforsog, Forsogsanlaeg Foulum, Postboks 39, DK-8833 Orum Sonderlying, Denmark.