First Calving Interval
Mostrando 1-12 de 20 artigos, teses e dissertações.
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1. 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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2. 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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3. 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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4. 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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5. Estimativas de parâmetros genéticos para habilidade de permanência no rebanho e suas associações com características de interesse econômico em vacas da raça gir leiteiro / Estimates of genetic parameters for stayability and their association with traits of economic interest in dairy cows gir breed
Com o objetivo de estimar parâmetros genéticos para stayability aos 48 e 60 meses de idade (STAY48 e STAY60) e suas associações com produção de leite na primeira lactação (P305), idade ao primeiro parto (IPP) e primeiro intervalo de partos (PIDP), foram analisados dados de 3.344 vacas pertencentes a seis rebanhos localizados nos estados de Minas Gera
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/02/2012
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6. Caracterização fenotípica de raças bubalinas nacionais e do tipo Baio.
O objetivo deste trabalho foi estudar a influência de fatores ambientais e genéticos nas características fenotípicas de búfalo (Bubalus bubalis) das raças Carabao, Jafarabadi, Murrah e Mediterrâneo e do tipo Baio. Os dados foram analisados usando-se o procedimento GLM do SAS (Statistical Analysis System), cujo modelo estatístico incluiu os efeitos fi
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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7. Association between reproductive traits and four microsatellites in Brangus-Ibagé cattle
The aim of the present study was to verify associations between reproductive efficiency and four microsatellite markers located in synteny with genes involved in the regulation of reproductive mechanisms. A sample of 107 females from a Brangus Ibagé population (5/8 Aberdeen Angus x 3/8 Nelore) was characterized for ETH225 (D9S1) and MM12E6 (D9S20) microsate
Publicado em: 2010
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8. SUPLEMENTAÇÃO COM SAIS DE CÁLCIO DE ÁCIDOS GRAXOS PARA VACAS DE CORTE MANTIDAS EM PASTAGEM NATURAL DURANTE O PERÍODO PRÉ E/OU PÓS-PARTO / SUPPLEMENTATION WITH CALCIUM SALTS OF FATTY ACIDS TO BEEF COWS MAINTENEID ON NATIVE PASTURE DURING TO PERIOD PRE AND/OUR POSTPARTUM
The objective of this study was to evaluate whether supplementation with calcium salts of fatty acids (CSFA) during to pre and/our postpartum affects production and composition of milk, metabolites blood, productive and reproductive performance from beef cows of different genetic groups maintained on native pasture, and performance of this calves. Were used
Publicado em: 2010
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9. Uso de cloprostenol e cipionato de estradiol, durante o puerpério, sobre a saúde uterina e a eficiência reprodutiva em fêmeas girolando / Use of cloprostenol and estradiol cypionate, during the postpartum on uterine health and reproductive efficiency in females girolando
The aim is to find ways of management to improve reproductive efficiency of dairy herds in recent post-partum through the use of analogues of PGF2(alfa) or cypionate of oestradiol, which may improve uterine health and reproductive efficiency. We used one hundred and fourteen cows girolandas randomly divided into three groups: CON - control; PGF2(alfa) - trea
Publicado em: 2009
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10. Avaliação do desempenho produtivo e reprodutivo de vacas leiteiras puras e mestiças da raça holandesa na Região do Alto do São Francisco-MG / Evaluation of the productive and reproductive performance of pure bred and crossbred Holstein dairy cows in the Alto do São Francisco-MG
The data used in this work were obtained from individual records on production and reproduction of black and white Holstein dairy cows, Holstein-Gir, Holstein- Gir, 7/8 Holstein-Gir, 15/16 Holstein-Gir and Holstein-Jersey, from 23 farms located in the region of Alto do São Francisco-MG. All the farms applied a very similar semiintensive management system. T
Publicado em: 2009
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11. Mycoplasmosis in cattle dairy calves: underlying factors for the occurrence and manifestation of the syndrome granular vaginitis / Micoplasmose em bovinos de aptidão leiteira: fatores predisponentes para a ocorrência e manifestação da síndrome vulvovaginite granular
The reduction of reproductive rates is measured by the reduction in the number of calves born that immediately reflected in the reduction of milk production and profitability of commercial property. The effect is the increased administrative costs of maintenance with dry cows, higher rates of rejection and a higher number of doses of semen for conception. Pa
Publicado em: 2009
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12. Non genetics effects on reproductive traits in Nellore female. / Efeitos não genéticos sobre as características reprodutivas de fêmeas da raça Nelore.
Reproductive performance of Nellore cattle herd, raised in pasture, without supplementation in dry season, in Baixada Litorânea region, Rio de Janeiro state, between 1980 and 2004, was analysed. The gestation length (GL) average was 293.30 + 0.13 days. The GL varied from 275 to 305 days, with a higher concentration (67.08%) between 287 and 299 days. The GL
Publicado em: 2008