Reproduction traits, growth traits and age at first calving in Holstein heifers
| Autor: | Bruna Silva Marestone, Évelyn Rangel dos Santos, Francisco Bruno Silva Serra, Carolina Amália de Souza Dantas Muniz, Cássia Perpétua Marques, Karina Biancon Alves, Marcelo Vaz Alves, Rodrigo Cesar Moreira Alves |
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| Jazyk: | English<br />Portuguese |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Semina: Ciências Agrárias, Vol 34, Iss 6Supl2, Pp 4105-4112 (2014) |
| Druh dokumentu: | article |
| ISSN: | 1679-0359 1676-546X |
| DOI: | 10.5433/1679-0359.2013v34n6Supl2p4105 |
| Popis: | The objective of this study was to verify the reproductive efficiency expressed by traits, interval from first to second calving (IDP), number of services per conception to the first calving (NSC1), number of services per conception for the second calving (NSC2), service period from the first to the second calving (PS) and gestation lenght (PG) of Holstein heifers. Data from 377 heifers from two herds, one in Santa Cruz do Rio Pardo, São Paulo and another in Rolândia, Paraná were analysed. The statistical model to analyze IDP, NSC1, NSC2, PS and PG included the fixed effect of Contemporary Group (CG). To analyze PG, it was also considered the effect of calf sex. To evaluate the growth performance and age at first calving (AFC), data from 360 Holstein heifers belonging to property in Rolândia were analysed. The model included the fixed effects of contemporary groups (CG) and average daily gain from birth to 15 months (ADG). A similar model was used to analyze weigth at 458 dias (W458) and ADG, therefore considering only CG. The overall means of IDP, NSC1, NSC2, PS and PG, were 14.96 ± 3.94 months; 1.35 ± 0.71 services, 2.86 ± 2.37 services, 178.83 ± 118.73 days; 276.67± 5.65 days, respectively. Correlations were observed between the traits IDP and NSC2 of 72% (P |
| Databáze: | Directory of Open Access Journals |
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