Data/hora: 06/06/2024 18:09:11

Biblioteca(s): | Embrapa Pantanal; Embrapa Rondônia.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | A - 2
Data corrente: | 01/04/2021
Data da última atualização: | 14/06/2021
Autoria: | PFEIFER, L. F. M.; RODRIGUES, W. B.; NOGUEIRA, E.
Afiliação: | LUIZ FRANCISCO MACHADO PFEIFER, CPAF-RO; WALVONVITIS BAES RODRIGUES, Fundação de Apoio ao Desenvolvimento do Ensino, Ciência e Tecnologia do Estado do Mato Grosso do Su; ERIKLIS NOGUEIRA, CPAP.
Título: | Relationship between body condition score index and fertility in beef cows subjected to timed artificial insemination.
Ano de publicação: | 2021
Fonte/Imprenta: | Livestock Science, v. 248, 104482, June 2021.
ISSN: | 1871-1413
DOI: | https://doi.org/10.1016/j.livsci.2021.104482
Idioma: | Inglês
Conteúdo: | Visual evaluation of body condition score (BCS) is an important method for the subjective quantification of body energy reserves in cattle. The objective of this study was to develop an index to estimate the relationship between BCS and fertility, using 2321 lactating Nelore cows from 29 cohorts in Mato Grosso do Sul and Rondonia states, Brazil enrolled in timed artificial insemination (TAI) programs. All females were evaluated according to BCS (scale 1 to 5) and were included in an estradiol-progesterone-based TAI protocol. Estrus scores were evaluated (scale 1?3) for all cows at TAI. The cows in each TAI protocol were categorized according to pregnancy per AI (P/AI) into low (< 45%, LF), moderate (45%?60%, MF), and high (>60%, HF) fertility groups. To evaluate whether the BCS of each cow was in accordance with the target BCS (3 to 4) for beef cows to be enrolled in TAI programs, three variables were calculated: (1) adequate BCS rate (ABR), in which cows with BCS on target received 100% and cows with BCS values outside the target range received 0%; (2) the difference between the real BCS and the target BCS (DBCS); and (3) the adjusted DBCS (ADBCS), in which DBCS was transformed into an inverse value. Finally, the average between ABR and ADBCS resulted in a BCS index (BCSi). Analysis of variance was used to compare BCSi, BCS, and estrus scores among fertility groups, and Tukey?s test was used to compare means among groups. There were differences in BCSi between fertility groups (P<0.05). Both the BCSi and BCS were highest in the HF groups, which also showed the highest estrus scores. However, the BCSi provides information that takes into account the proportion of cows with or without adequate BCS, and could be more useful to apply in practice. The results demonstrate that determining the BCSi presents a novel approach that is highly associated with fertility in TAI programs.
Palavras-Chave: | Mato Grosso do Sul; Rondônia.
Thesagro: | Condição Corporal; Fertilidade Animal; Gado Nelore; Inseminação Artificial; Lactação; Prenhez; Reprodução Animal; Vaca de Corte.
Thesaurus Nal: | Animal fertility; Animal reproduction; Artificial insemination; Beef cows; Body condition; Lactation; Nellore; Pregnancy.
Categoria do assunto: | L Ciência Animal e Produtos de Origem Animal
Registro original: | Embrapa Rondônia (CPAF-RO)

Exemplares:

CPAF-RO - (18542-1) - UPC - AP - DD -  -  -  - DIS
CPAP - (60630-1) - UPC - AP - DD -  -  -  - DIS