Prediction of performance of progeny from test station boars
Article Abstract:
A study was done to determine whether the performance of progeny raised under commercial pig production conditions can be predicted from the traits of test station boars selected to represent high and low indexes at the test station. Regression coefficients of progeny traits on average daily gain (ADG), days to 104.3 kg (DAYS), backfat thickness (BF), feed conversion ratio (FC) and INDEX of Duroc and Yorkshire boars were computed. The results showed that progeny performance can be predicted from a large number of boars. However, progeny performance estimated from individual boars is not reliable. Further studies should determine genotype and environmental interactions.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Effect of frequency of administration of exogenous porcine growth hormone on growth and carcass traits and ovarian function of prepubertal gilts
Article Abstract:
Daily administration of porcine growth hormone (pGH) improved the average daily weight gain and feed utilization efficiency in prepubertal gilts on a dose-dependent basis. The alternate-week administration of pGH resulted in gains similar to controls. Gilts treated with pGH were found to have reduced backfat thickness. Administration of pGH increased the levels of estradiol and insulin-like growth factor (IGF)-1 in serum and follicular fluid, reduced the concentration of IGF-2 in serum and increased ovary weight in a dose- and frequency-dependent manner.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Effect of light intensity on circadian profiles of melatonin, prolactin, ACTH, and cortisol in pigs
Article Abstract:
The effect of light on the circadian rhythm of hormones was studied in 11 crossbred barrows. Pigs were distributed into rooms with different light intensities and exposed for eight hours a day for 20 days. Assays from blood samples taken after the indicated time of exposure reveal that it takes a high light intensity to stimulate circadian rhythm of melatonin in pigs. Prolactin response is present even in photoperiods and cortisol shows no response at all.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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