First Calving
Mostrando 1-12 de 71 artigos, teses e dissertações.
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1. Inflammation: friend or foe of bovine reproduction?
Abstract Inflammation is not only the first line of defense of the organism but is also required in many reproductive processes such as ovulation, corpus luteum development, luteolysis, uterine clearance after insemination and post partum. Nevertheless, if excessive or persistent, inflammation can switch from a positive mechanism to a deleterious process, im
Anim. Reprod.. Publicado em: 28/11/2019
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2. Genetic evaluation of milking buffaloes (Bubalus bubalis): bull ranking
RESUMO O objetivo deste estudo foi avaliar os aspectos genéticos relacionados à produção e à eficiência reprodutiva de búfalas das raças Murrah, Mediterrâneo e suas cruzas. Uma classificação de touros da Embrapa Amazônia Oriental também foi composta para orientar os cruzamentos assistidos. Foram utilizados 2.322 registros de nascimento de búfal
Arq. Bras. Med. Vet. Zootec.. Publicado em: 28/10/2019
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3. Inbreeding depression in Holstein cattle in Brazil
ABSTRACT The objective of this study was to evaluate inbreeding depression in Holstein cows in Brazil, considering their 305-day milk production (MP), age of first calving (AFC), and calving interval (CI). The effects of inbreeding depression on the traits were determined using four regression models (linear, quadratic, exponential, and Michaelis-Menten) abo
R. Bras. Zootec.. Publicado em: 12/09/2019
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4. Genetic parameters, genetic trends, and principal component analysis for productive and reproductive traits of Guzera beef cattle
ABSTRACT The objectives of this study were to estimate genetic parameters and genetic trends and perform principal component analysis for the following traits: body weight adjusted at 210 days of age (W210), one year (W365), and yearling or 450 days of age (W450); weight gain from birth to weaning or 210 days of age (WGBW), from weaning to 365 days of age (W
R. Bras. Zootec.. Publicado em: 12/09/2019
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5. Adaptability and phenotypic stability for productive and reproductive traits in Nelore cattle
RESUMO: O objetivo deste trabalho foi estimar parâmetros de adaptabilidade e estabilidade para touros da raça Nelore em três regiões diferentes. As características analisadas foram o peso aos 420 dias de idade (P420) e a idade ao primeiro parto (IPP) de animais criados em regime de pasto. As informações utilizadas no estudo foram referentes a média
Cienc. Rural. Publicado em: 21/03/2019
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6. Genotype x Environment Interaction for reproductive traits in brazilian Nellore breed cattle
RESUMO O presente estudo teve como objetivo avaliar o efeito da interação genotipo-ambiente (IGA) para as características perímetro escrotal mensurado em diferentes idades, 365 (PE365), 450 (PE450) e 550 (PE550) dias de idade, e da idade ao primeiro parto (IPP) para animais da raça Nelore criados em diferentes regiões do Brasil. Para a avaliação fora
Rev. bras. saúde prod. anim.. Publicado em: 07/02/2019
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7. Serum biochemical profile of neonatal buffalo calves
RESUMO Amostras de sangue de 50 bezerros de búfalo Murrah foram examinados nesse estudo. Os animais foram distribuídos em três grupos de acordo com a paridade de suas genitoras: G1 (n=15) bezerros de búfalas primíparas, G2 (n=19) bezerros de búfalas com 2 a 4 gestações, e G3 (n=16) bezerros de búfalas com cinco ou mais gestações. Amostras de sangu
Arq. Bras. Med. Vet. Zootec.. Publicado em: 2019-02
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8. Phenotypic relationships between type traits and productive life using a piecewise Weibull proportional hazard model
ABSTRACT: Longevity is an important trait due to its relationship with profitability. Type traits have been used as indirect predictors for productive life. The objective of this study was to evaluate the relationship of 20 type traits on length of productive life in Brazilian Holsteins, using a piecewise Weibull proportional hazard model. Three analyses wer
Sci. agric. (Piracicaba, Braz.). Publicado em: 2018-12
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9. Productive and Reproductive Perfomance of Dairy Cows During Peripartum
ABSTRACT Dairy activity is of great importance for the national economy. It is also an important source of income for families in the south east region of Paraná that work in this area. There has been a notable expansion in the activities as well as in the quantity of production and the quality of the products. With this has come problems in the reproductiv
Braz. arch. biol. technol.. Publicado em: 14/11/2018
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10. Genetic parameters of age at first calving, weight gain, and visual scores in Nelore heifers
ABSTRACT This study aimed at estimating the heritability of age at first calving and of performance traits included in the selection index and the genetic correlations between age at first calving and these performance traits. Data were extracted from the Conexão Delta G database and only data from herds in which heifers were bred younger than 24 months of
R. Bras. Zootec.. Publicado em: 2017-04
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11. Genetic associations between reproductive and linear-type traits of Holstein cows in Brazil
ABSTRACT This study aimed to estimate heritability, genetic, and residual correlations between reproductive traits such as age at first calving, calving interval, dry period, and first service period and linear type traits measured in Holstein cows born between the years 1990 and 2008 in Brazil. The (co)variance components were estimated by restricted maximu
R. Bras. Zootec.. Publicado em: 2017-02
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12. Sugarcane bagasse as exclusive roughage for dairy heifers
ABSTRACT The objective of this study was to evaluate the effect of different concentrate levels (40, 50, 60, and 70% on dry matter basis) on intake, digestibility of nutrients, and performance of heifers fed sugarcane bagasse as exclusive roughage. Twenty Girolando heifers, with an average body weight of 198±25.6 kg were assigned to a completely randomized
R. Bras. Zootec.. Publicado em: 2017-01