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United States Department of Agriculture

Agricultural Research Service

Title: Effects of Muscularity on Pelvic Area and Efficiency in Hereford, Limousin and Piedmontese F*2 Crossbred Calves Genotyped for the Piedmontese Myostatin Allele

Authors
item Short, Robert
item Grosz, Michael
item Macneil, Michael
item Grings, Elaine

Submitted to: European Association of Animal Production Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: March 1, 2000
Publication Date: March 1, 2000
Citation: SHORT, R., GROSZ, M.D., MACNEIL, M.D., GRINGS, E.E. EFFECTS OF MUSCULARITY ON PELVIC AREA AND EFFICIENCY IN HEREFORD, LIMOUSIN AND PIEDMONTESE F*2 CROSSBRED CALVES GENOTYPED FOR THE PIEDMONTESE MYOSTATIN ALLELE. EUROPEAN ASSOCIATION OF ANIMAL PRODUCTION PROCEEDINGS. 2000. p. 9.

Interpretive Summary: Similar body weight genotypes, especially double muscled, that differ in muscularity may differ in traits other than muscularity. To test this hypothesis, Hereford (normal muscling, H), Limousin (moderate muscling, L) and Piedmontese (double muscled, P) sires (20 to 25 per breed) were bred to crossbred cows to produce F1 calves which were inter se mated within sire breed to produce F2 calves. P-cross F2 calves were genotyped for the G-A transition mutation at the myostatin locus characteristic of P (msP), and their genotypes were classified on the basis of having 0 (P0), 1 (P1) or 2 (P2) copies of the mutant P allele. Parents of P-cross F2 calves were assumed to be P1, and H and L F2 calves were assumed to be ms normal (H0, L0). Pelvic area (PA) was measured at slaughter and was affected by genotype (P<.01) with most of the effect resulting from a larger PA in P0 with a progressive decrease as msP alleles were added (N and PA, cm**2, for H0, L0, P0, P1 and P2, respectively, were 69, 171; 60, 175; 19, 185; 32, 175 and 15, 168). Live weight gain (G, kg) and food intake (metabolisable energy, ME, Mcal and crude protein, CP, kg) were measured during a 90 or 132 day finishing period which started at 338 kg for heifers and 383 kg for steers. G was highest in L0 and lowest in P (P<.01) with no effects of the msP allele. ME and CP intake were highest in P0 and lowest in P2 (P<.05). N, G, ME and CP for H0, L0, P0, P1 and P2, respectively, were 135, 109, 2443, 109; 136, 115, 2415, 108; 30, 101, 2512, 113; 82, 102, 2505, 112 and 28, 101, 2325, 104.

Technical Abstract: Similar body weight genotypes, especially double muscled, that differ in muscularity may differ in traits other than muscularity. To test this hypothesis, Hereford (normal muscling, H), Limousin (moderate muscling, L) and Piedmontese (double muscled, P) sires (20 to 25 per breed) were bred to crossbred cows to produce F1 calves which were inter se mated within sire breed to produce F2 calves. P-cross F2 calves were genotyped for the G-A transition mutation at the myostatin locus characteristic of P (msP), and their genotypes were classified on the basis of having 0 (P0), 1 (P1) or 2 (P2) copies of the mutant P allele. Parents of P-cross F2 calves were assumed to be P1, and H and L F2 calves were assumed to be ms normal (H0, L0). Pelvic area (PA) was measured at slaughter and was affected by genotype (P<.01) with most of the effect resulting from a larger PA in P0 with a progressive decrease as msP alleles were added (N and PA, cm**2, for H0, L0, P0, P1 and P2, respectively, were 69, 171; 60, 175; 19, 185; 32, 175 and 15, 168). Live weight gain (G, kg) and food intake (metabolisable energy, ME, Mcal and crude protein, CP, kg) were measured during a 90 or 132 day finishing period which started at 338 kg for heifers and 383 kg for steers. G was highest in L0 and lowest in P (P<.01) with no effects of the msP allele. ME and CP intake were highest in P0 and lowest in P2 (P<.05). N, G, ME and CP for H0, L0, P0, P1 and P2, respectively, were 135, 109, 2443, 109; 136, 115, 2415, 108; 30, 101, 2512, 113; 82, 102, 2505, 112 and 28, 101, 2325, 104.

Last Modified: 12/25/2014
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