HEIFER GROWTH IN SEVERAL STRAINS OF HOLSTEINS AND AYRSHIRES AND IN PROGENY OF AYRSHIRE COWS MATED TO BROW SWISS AND NORWEGIAN RED BULLS

Autor:	A.J. Lee, T.R. Batra, K.A. Winter, J.A. Vesely, J. P. F. Darisse, G.L. Roy, A. E. Emsley, A.J. McAllister
Rok vydání:	1982
Předmět:	Veterinary medicine Pregnancy animal structures animal diseases Sire Ice calving Biology medicine.disease Animal science Food Animals Herd medicine Animal Science and Zoology Parity (mathematics) Norwegian Red reproductive and urinary physiology
Zdroj:	Canadian Journal of Animal Science. 62:1063-1078
ISSN:	1918-1825 0008-3984
DOI:	10.4141/cjas82-126
Popis:	Body weights and measurements were compared among several genetic groups from the 496 Holstein-based H line heifers and 344 Ayrshire-based A line heifers. Differences among herds (Charlottetown, P.E.I., Lennoxville and Normandin, Que.; Ottawa, Ont., and Lethbridge, Alta) were large and highly significant (P 0.05). Birth weights were 4.1 kg lighter for calves from first parity dams and 1.4 kg lighter for second parity dams than fourth or later parity dams. Heifers calving at earlier ages for the first time were generally heavier and larger at 66 and 82 wk than those calving later, reflecting the effects of concurrent pregnancy. H line heifers were significantly heavier and larger in all measurements than A line heifers. Differences among the Canadian, American, and Research Branch Holstein sire groups were small and generally not significant (P > 0.05). Brown Swiss progeny were significantly (P
Databáze:	OpenAIRE
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