Management and nutrition strategies to reduce the breeding season in beef cows
Effects of temporary calf removal and phosphorus supplementation on conception rate in a 60 or 120 day breeding season period was observed in several trials conducted over three years on Nelore cows. Experiment I involved 47 acyclic Nelore cows with suckling calves ranging in age from 55 to 70 days. Calves were temporarily removed from their dams for 48 h at the beginning of the trial or stayed with the dams throughout the trial. The proportion of cows that cycled during the breeding season was 5 out of 25 (20%) in the control group and I5 out of 22 (68%) in the group whose calves had been removed (p<0.05). In Experiment II, 66 acyclic Nelore cows, averaging 60 ± 0.57 (x ± SE) days post-partum were allocated at random in three groups as follows: A, calves temporarily removed from their dams for 48 h on the first day of the breeding season; B, similar to Group A, except that calves were removed for 72 h and C, control group (no calf removal). The percentage of pregnant cows at the end of the breeding season was 54.6 in control cows compared with 50.0 in the 48 h removal group and 63.6 in the 72 h removal group. In Experiment III, 75 pregnant cows were selected in the final trimester of gestation. Cows were allocated at random in four groups: Group A, the cows received a free choice mineral mixture with 12% p during three months before and three months after the calving season, furthermore, calves were temporarily removed from their dams on first day of breeding season for a period of 96 h; B, same as Group A, except that the calves were not removed; C, same as Group A, except that the mineral mixture had 8.8% P; and D: same as Group C, except no calf removal. More cows receiving 12% P were cycling (p<0.05) at 30, 60 and 90 days into the breeding season. Under these trial conditions, restricted suckling for 48, 72 or 96 h prior to the breeding season caused inconsistent results on pregnancy rates. However, the restricted suckling of cows with marginal range plasma phosphorus (<4.0 mg/100 ml) enhanced ovarian function.
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Faculdade de Medicina Veterinária e Zootecnia / Universidade de São Paulo
1998
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oai:scielo:S1413-959619980003000102000-08-10Management and nutrition strategies to reduce the breeding season in beef cowsMEIRELLES,Cyro FerreiraVITTI,Dorinha Miriam Silber SchmidtABDALLA,Adibe Luiz Nelore cows Restricting suckling Mineral supplements Conception rate Effects of temporary calf removal and phosphorus supplementation on conception rate in a 60 or 120 day breeding season period was observed in several trials conducted over three years on Nelore cows. Experiment I involved 47 acyclic Nelore cows with suckling calves ranging in age from 55 to 70 days. Calves were temporarily removed from their dams for 48 h at the beginning of the trial or stayed with the dams throughout the trial. The proportion of cows that cycled during the breeding season was 5 out of 25 (20%) in the control group and I5 out of 22 (68%) in the group whose calves had been removed (p<0.05). In Experiment II, 66 acyclic Nelore cows, averaging 60 ± 0.57 (x ± SE) days post-partum were allocated at random in three groups as follows: A, calves temporarily removed from their dams for 48 h on the first day of the breeding season; B, similar to Group A, except that calves were removed for 72 h and C, control group (no calf removal). The percentage of pregnant cows at the end of the breeding season was 54.6 in control cows compared with 50.0 in the 48 h removal group and 63.6 in the 72 h removal group. In Experiment III, 75 pregnant cows were selected in the final trimester of gestation. Cows were allocated at random in four groups: Group A, the cows received a free choice mineral mixture with 12% p during three months before and three months after the calving season, furthermore, calves were temporarily removed from their dams on first day of breeding season for a period of 96 h; B, same as Group A, except that the calves were not removed; C, same as Group A, except that the mineral mixture had 8.8% P; and D: same as Group C, except no calf removal. More cows receiving 12% P were cycling (p<0.05) at 30, 60 and 90 days into the breeding season. Under these trial conditions, restricted suckling for 48, 72 or 96 h prior to the breeding season caused inconsistent results on pregnancy rates. However, the restricted suckling of cows with marginal range plasma phosphorus (<4.0 mg/100 ml) enhanced ovarian function.info:eu-repo/semantics/openAccessFaculdade de Medicina Veterinária e Zootecnia / Universidade de São PauloBrazilian Journal of Veterinary Research and Animal Science v.35 n.3 19981998-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95961998000300010en10.1590/S1413-95961998000300010 |
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MEIRELLES,Cyro Ferreira VITTI,Dorinha Miriam Silber Schmidt ABDALLA,Adibe Luiz |
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MEIRELLES,Cyro Ferreira VITTI,Dorinha Miriam Silber Schmidt ABDALLA,Adibe Luiz Management and nutrition strategies to reduce the breeding season in beef cows |
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MEIRELLES,Cyro Ferreira VITTI,Dorinha Miriam Silber Schmidt ABDALLA,Adibe Luiz |
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MEIRELLES,Cyro Ferreira |
title |
Management and nutrition strategies to reduce the breeding season in beef cows |
title_short |
Management and nutrition strategies to reduce the breeding season in beef cows |
title_full |
Management and nutrition strategies to reduce the breeding season in beef cows |
title_fullStr |
Management and nutrition strategies to reduce the breeding season in beef cows |
title_full_unstemmed |
Management and nutrition strategies to reduce the breeding season in beef cows |
title_sort |
management and nutrition strategies to reduce the breeding season in beef cows |
description |
Effects of temporary calf removal and phosphorus supplementation on conception rate in a 60 or 120 day breeding season period was observed in several trials conducted over three years on Nelore cows. Experiment I involved 47 acyclic Nelore cows with suckling calves ranging in age from 55 to 70 days. Calves were temporarily removed from their dams for 48 h at the beginning of the trial or stayed with the dams throughout the trial. The proportion of cows that cycled during the breeding season was 5 out of 25 (20%) in the control group and I5 out of 22 (68%) in the group whose calves had been removed (p<0.05). In Experiment II, 66 acyclic Nelore cows, averaging 60 ± 0.57 (x ± SE) days post-partum were allocated at random in three groups as follows: A, calves temporarily removed from their dams for 48 h on the first day of the breeding season; B, similar to Group A, except that calves were removed for 72 h and C, control group (no calf removal). The percentage of pregnant cows at the end of the breeding season was 54.6 in control cows compared with 50.0 in the 48 h removal group and 63.6 in the 72 h removal group. In Experiment III, 75 pregnant cows were selected in the final trimester of gestation. Cows were allocated at random in four groups: Group A, the cows received a free choice mineral mixture with 12% p during three months before and three months after the calving season, furthermore, calves were temporarily removed from their dams on first day of breeding season for a period of 96 h; B, same as Group A, except that the calves were not removed; C, same as Group A, except that the mineral mixture had 8.8% P; and D: same as Group C, except no calf removal. More cows receiving 12% P were cycling (p<0.05) at 30, 60 and 90 days into the breeding season. Under these trial conditions, restricted suckling for 48, 72 or 96 h prior to the breeding season caused inconsistent results on pregnancy rates. However, the restricted suckling of cows with marginal range plasma phosphorus (<4.0 mg/100 ml) enhanced ovarian function. |
publisher |
Faculdade de Medicina Veterinária e Zootecnia / Universidade de São Paulo |
publishDate |
1998 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95961998000300010 |
work_keys_str_mv |
AT meirellescyroferreira managementandnutritionstrategiestoreducethebreedingseasoninbeefcows AT vittidorinhamiriamsilberschmidt managementandnutritionstrategiestoreducethebreedingseasoninbeefcows AT abdallaadibeluiz managementandnutritionstrategiestoreducethebreedingseasoninbeefcows |
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