C.C. Brauner, V.S. Izquierdo, J.M.B. Vendramini, P. Moriel
{"title":"育期发情同步和体重对暖季牧草影响的肉牛繁殖成功的12年总结","authors":"C.C. Brauner, V.S. Izquierdo, J.M.B. Vendramini, P. Moriel","doi":"10.15232/aas.2024-02630","DOIUrl":null,"url":null,"abstract":"<div><h3>Objective</h3><div>The objective was to evaluate the effects of estrus synchronization and body weight before the start of breeding season on reproduction of <em>Bos indicus</em>-influenced beef heifers.</div></div><div><h3>Materials and Methods</h3><div>Data were collected from grazing, Brangus crossbred beef heifers (n = 594) weaned at 280 ± 26 d of age and fed concentrate from 2 wk after weaning until the end of the breeding season (189 ± 24 d of supplementation). Heifers were initially sorted into those that were (SYNC) and were not (NOSYNC) as- signed to an estrous synchronization protocol before the start of the breeding season. Then, within each synchro- nization group, heifers were sorted into those that were below (BE) or above (AB) 295 kg (65% of mature BW) at the start of the breeding season.</div></div><div><h3>Results and Discussion</h3><div>Effects of synchronization × BW at breeding and synchronization were not detected for growth performance, but tended to be detected for pu- berty attainment, which was the least for NOSYNC+BE, did not differ between SYNC+BE versus NOSYNC+AB, and was greatest for SYNC+AB heifers. Pregnancy and calving percentages were greater for AB versus BE heifers.</div></div><div><h3>Implications and Applications</h3><div>Results of this study indicate that <em>Bos indicus</em>-influenced beef heifers need to achieve ≥65% of mature BW at the start of the breeding season to optimize reproduction, whereas estrous synchro- nization protocols enhanced puberty attainment (regard- less of BW) and early calving distribution when heifers were <65% of mature BW at the start of the breeding season.</div></div>","PeriodicalId":8519,"journal":{"name":"Applied Animal Science","volume":"40 6","pages":"Pages 847-854"},"PeriodicalIF":1.5000,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A 12-year summary of the effects of estrous synchronization and body weight at breeding on reproductive success of Bos indicus-influenced beef heifers grazing warm-season grasses\",\"authors\":\"C.C. Brauner, V.S. Izquierdo, J.M.B. Vendramini, P. Moriel\",\"doi\":\"10.15232/aas.2024-02630\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><h3>Objective</h3><div>The objective was to evaluate the effects of estrus synchronization and body weight before the start of breeding season on reproduction of <em>Bos indicus</em>-influenced beef heifers.</div></div><div><h3>Materials and Methods</h3><div>Data were collected from grazing, Brangus crossbred beef heifers (n = 594) weaned at 280 ± 26 d of age and fed concentrate from 2 wk after weaning until the end of the breeding season (189 ± 24 d of supplementation). Heifers were initially sorted into those that were (SYNC) and were not (NOSYNC) as- signed to an estrous synchronization protocol before the start of the breeding season. Then, within each synchro- nization group, heifers were sorted into those that were below (BE) or above (AB) 295 kg (65% of mature BW) at the start of the breeding season.</div></div><div><h3>Results and Discussion</h3><div>Effects of synchronization × BW at breeding and synchronization were not detected for growth performance, but tended to be detected for pu- berty attainment, which was the least for NOSYNC+BE, did not differ between SYNC+BE versus NOSYNC+AB, and was greatest for SYNC+AB heifers. Pregnancy and calving percentages were greater for AB versus BE heifers.</div></div><div><h3>Implications and Applications</h3><div>Results of this study indicate that <em>Bos indicus</em>-influenced beef heifers need to achieve ≥65% of mature BW at the start of the breeding season to optimize reproduction, whereas estrous synchro- nization protocols enhanced puberty attainment (regard- less of BW) and early calving distribution when heifers were <65% of mature BW at the start of the breeding season.</div></div>\",\"PeriodicalId\":8519,\"journal\":{\"name\":\"Applied Animal Science\",\"volume\":\"40 6\",\"pages\":\"Pages 847-854\"},\"PeriodicalIF\":1.5000,\"publicationDate\":\"2024-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Applied Animal Science\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2590286524001241\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"AGRICULTURE, DAIRY & ANIMAL SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Animal Science","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2590286524001241","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"AGRICULTURE, DAIRY & ANIMAL SCIENCE","Score":null,"Total":0}
A 12-year summary of the effects of estrous synchronization and body weight at breeding on reproductive success of Bos indicus-influenced beef heifers grazing warm-season grasses
Objective
The objective was to evaluate the effects of estrus synchronization and body weight before the start of breeding season on reproduction of Bos indicus-influenced beef heifers.
Materials and Methods
Data were collected from grazing, Brangus crossbred beef heifers (n = 594) weaned at 280 ± 26 d of age and fed concentrate from 2 wk after weaning until the end of the breeding season (189 ± 24 d of supplementation). Heifers were initially sorted into those that were (SYNC) and were not (NOSYNC) as- signed to an estrous synchronization protocol before the start of the breeding season. Then, within each synchro- nization group, heifers were sorted into those that were below (BE) or above (AB) 295 kg (65% of mature BW) at the start of the breeding season.
Results and Discussion
Effects of synchronization × BW at breeding and synchronization were not detected for growth performance, but tended to be detected for pu- berty attainment, which was the least for NOSYNC+BE, did not differ between SYNC+BE versus NOSYNC+AB, and was greatest for SYNC+AB heifers. Pregnancy and calving percentages were greater for AB versus BE heifers.
Implications and Applications
Results of this study indicate that Bos indicus-influenced beef heifers need to achieve ≥65% of mature BW at the start of the breeding season to optimize reproduction, whereas estrous synchro- nization protocols enhanced puberty attainment (regard- less of BW) and early calving distribution when heifers were <65% of mature BW at the start of the breeding season.
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