| Autor: |
Kuhlers, Daryl L., Jungst, Steve B., Edwards, Ronnie L. |
| Zdroj: |
Journal of Animal Science; April 1980, Vol. 50 Issue: 4 p604-609, 6p |
| Abstrakt: |
One-hundred thirty-three litters out of Landrace females bred to Landrace, Duroc and Yorkshire males were evaluated for maternal performance, and the offspring resulting from these matings were evaluated for postweaning performance. Crossing Landrace females with either Duroc or Yorkshire males resulted in heavier 21-day and 42-day postweaning litter weights than did crossing Landrace females with Landrace boars (P<.01). Crossbred pigs had a higher survival rate from birth to weaning at 42 days of age (P<.05) and were heavier at birth (P<.01), 21 (P<.05) and 42 days of age (P<.01) than purebred pigs. Postweaning gains were .05 kg/day less (P<.01), days to 100 kg was 10.7 days more (P<.01) and feed conversion was .27 kg feed/kg gain higher in the Landrace sired pigs than the Duroc and Yorkshire sired pigs (P<.01). Carcasses of the Landrace sired pigs had more backfat (P<.05), smaller loineye areas (P<.01) and a lower percentage lean cuts (P<.01) than the Duroc and Yorkshire sired pigs. Duroc sired litters tended to have heavier 21- and 42-day litter weights (P<.10) than Yorkshire sired litters. Duroc sired pigs grew more slowly during the postweaning period (P<.01), reached 100 kg 2.1 days later (P<.05) but converted feed to gain more efficiently (P<.01) than Yorkshire cross pigs and had a higher percentage lean cuts (P<.01), less backfat (P<.01) and larger loineye areas (P<.01). |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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