Effects of Duroc, Meishan, Fengjing, and Minzhu boars on productivity of mates and growth of first-cross progeny
Article Abstract:
The effects of Meishan, Duroc, Fengjing and Minzhu boars on the productivity of crossbred gilts and performance of first-cross progeny were studied. Productivity was assessed in terms of litter numbers while progeny performance was assessed in terms of number of nipples, survival rates, weight at different ages, backfat thickness and feed efficiency. The boars had significant effects which varied according to the parameter being measured. The results indicate that using the Chinese breeds in crossbreeding programs will result in decreased performance traits. The manner of offsetting decreased performance traits is discussed.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Reproductive rate and genetic variation in composite and parental populations: experimental results in sheep
Article Abstract:
Two crossbred sheep populations and contemporary populations of the parental breeds were compared with respect to ewe reproductive performance to evaluate the populations' potential for continued selection of the trait. Composite populations were shown to have better performance with respect to number of lambs weaned per ewe compared to the parental breeds. Although heritability of birth rate was higher among crossbred sheep populations, the heritability of fertility and lamb viability was higher in parental lines. The advantage of crossbred sheep may depend on selection intensity rather than genetic variability.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Effects of Duroc, Meishan, Fengjing, and Minzhu boars on carcass traits of first-cross barrows
Article Abstract:
Duroc, Fengjing, Meishan and Minzhu boars were mated with crossbred gilts and their first-cross barrows were assessed for carcass traits. The results showed that breed of sire effects were significant for age-adjusted traits except for fat thickness at the last rib, color score, firmness score and carcass length. Carcass weights, backfat, longissimus muscle area, weight of trimmed wholesale lean cut, weight of leaf fat and other carcass composition traits were compared among all four cross types.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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