Increased postweaning gain of beef heifers enhances fertility and milk production
Four hundred fifty-two (452) weanling heifer calves (192 +/- 23 kg) were used to determine the effect of postweaning weight gain on subsequent reproductive performance and lactation. Heifers grazed stockpiled tall fescue pastures and were fed a high (H) or low (L) amount of ground corn supplement (3...
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| Published in: | Journal of animal science Vol. 73; no. 4; pp. 937 - 946 |
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| Main Authors: | , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Savoy, IL
Am Soc Animal Sci
01-04-1995
American Society of Animal Science Oxford University Press |
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| Online Access: | Get full text |
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| Abstract | Four hundred fifty-two (452) weanling heifer calves (192 +/- 23 kg) were used to determine the effect of postweaning weight gain on subsequent reproductive performance and lactation. Heifers grazed stockpiled tall fescue pastures and were fed a high (H) or low (L) amount of ground corn supplement (3.68 and 2.99 kg/[animal-d], respectively) during a postweaning treatment period of 136 d. Postweaning gain of heifers receiving L and H was 0.43 and.0.62 kg/d, respectively. These treatments resulted in a range of postweaning gain from 0.07 to 1.17 kg/d. Heifers receiving H were 26 kg heavier (P 0.01), had 0.15 cm more fat thickness (P 0.01), 5% greater pelvic area (P 0.01), and tended (P |
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| AbstractList | Four hundred fifty-two (452) weanling heifer calves (192 +/- 23 kg) were used to determine the effect of postweaning weight gain on subsequent reproductive performance and lactation. Heifers grazed stockpiled tall fescue pastures and were fed a high (H) or low (L) amount of ground corn supplement (3.68 and 2.99 kg/[animal.d], respectively) during a postweaning treatment period of 136 d. Postweaning gain of heifers receiving L and H was .43 and .62 kg/d, respectively. These treatments resulted in a range of postweaning gain from .07 to 1.17 kg/d. Heifers receiving H were 26 kg heavier (P < .01), had .15 cm more fat thickness (P < .01), 5% greater pelvic area (P < .01), and tended (P = .08) to have greater hip height than heifers receiving L at yearling. More heifers in the H group were pubertal before the start of the breeding season (70.9 vs 61.3%) (P < .05). No significant differences were found in pregnancy rate or first-service calving rate between treatment groups. Mean milk production was 10% greater for H- than for L-fed heifers (P < .01) and resulted in heavier calves at 54, 104, and 153 d of age (P < .05). Regression analysis revealed that as weaning weight and postweaning gain increased, so did the probability for reaching puberty before the breeding season. Increasing weaning weight also increased the probability of calving to the first AI service. As heifer weaning weight and postweaning gain increased, subsequent milk production also increased. Increasing postweaning weight gain of lightweight heifers from .07 to 1.17 kg/d increased both reproductive and lactation performance. Four hundred fifty-two (452) weanling heifer calves (192 +/- 23 kg) were used to determine the effect of postweaning weight gain on subsequent reproductive performance and lactation. Heifers grazed stockpiled tall fescue pastures and were fed a high (H) or low (L) amount of ground corn supplement (3.68 and 2.99 kg/[animal-d], respectively) during a postweaning treatment period of 136 d. Postweaning gain of heifers receiving L and H was 0.43 and.0.62 kg/d, respectively. These treatments resulted in a range of postweaning gain from 0.07 to 1.17 kg/d. Heifers receiving H were 26 kg heavier (P 0.01), had 0.15 cm more fat thickness (P 0.01), 5% greater pelvic area (P 0.01), and tended (P Four hundred fifty-two (452) weanling heifer calves (192 +/- 23 kg) were used to determine the effect of postweaning weight gain on subsequent reproductive performance and lactation. Heifers grazed stockpiled tall fescue pastures and were fed a high (H) or low (L) amount of ground corn supplement (3.68 and 2.99 kg/[animal.d], respectively) during a postweaning treatment period of 136 d. Postweaning gain of heifers receiving L and H was .43 and .62 kg/d, respectively. These treatments resulted in a range of postweaning gain from .07 to 1.17 kg/d. Heifers receiving H were 26 kg heavier (P < .01), had .15 cm more fat thickness (P < .01), 5% greater pelvic area (P < .01), and tended (P = .08) to have greater hip height than heifers receiving L at yearling. More heifers in the H group were pubertal before the start of the breeding season (70.9 vs 61.3%) (P < .05). No significant differences were found in pregnancy rate or first-service calving rate between treatment groups. Mean milk production was 10% greater for H- than for L-fed heifers (P < .01) and resulted in heavier calves at 54, 104, and 153 d of age (P < .05). Regression analysis revealed that as weaning weight and postweaning gain increased, so did the probability for reaching puberty before the breeding season. Increasing weaning weight also increased the probability of calving to the first AI service. As heifer weaning weight and postweaning gain increased, subsequent milk production also increased. Increasing postweaning weight gain of lightweight heifers from .07 to 1.17 kg/d increased both reproductive and lactation performance. |
| Author | Buskirk, D.D. (University of Illinois, Urbana.) Ireland, F.A Faulkner, D.B |
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| Copyright | 1995 INIST-CNRS Copyright American Society of Animal Science Apr 1995 |
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| Keywords | Lactation Fertility Weaning Production Dairy cattle Supplemented diet Reproductive potential Weight gain Milk |
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| SubjectTerms | AGE Aging - metabolism Aging - physiology Animal Feed - standards Animal productions Animal reproduction Animals Biological and medical sciences BOVIN DE BOUCHERIE Breeding Cattle Cattle - growth & development Cattle - physiology COMPLEMENT ALIMENTAIRE COMPOSICION QUIMICA COMPOSITION CHIMIQUE CONDICION CORPORAL Dairy farms DESTETE Diet EDAD ETAT CORPOREL Female Fertility - physiology Food, Fortified Fundamental and applied biological sciences. Psychology GAIN DE POIDS GANADO DE CARNE GANANCIA DE PESO GENISSE ILLINOIS Lactation - physiology LAIT LECHE MADUREZ SEXUAL MAIS MAIZ MATURITE SEXUELLE MEDICION DEL CUERPO MENSURATION CORPORELLE Milk - metabolism NOVILLA PERFORMANCE DE REPRODUCTION PESO AL DESTETE POIDS AU SEVRAGE Random Allocation Regression Analysis RENDEMENT LAITIER RENDIMIENTO LECHERO REPRODUCTIVIDAD SEVRAGE Sexual Maturation - physiology SUPLEMENTOS TEJIDO ADIPOSO TERNERO Terrestrial animal productions TISSU ADIPEUX VEAU Vertebrates Weaning Weight Gain - physiology Zea mays - standards |
| Title | Increased postweaning gain of beef heifers enhances fertility and milk production |
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