Cow Calf
Mostrando 1-12 de 59 artigos, teses e dissertações.
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1. Experimental reproduction of congenital anomalies in the progeny of cows fed apple pomace during pregnancy
RESUMO: O presente trabalho tem por finalidade descrever e discutir os resultados do experimento realizado em vacas prenhes que foram alimentadas com 25kg/dia de bagaço de maçã. Experimentos foram conduzidos em duas etapas, a primeira no ano de 2015, de setembro a dezembro onde foram utilizadas 16 vacas prenhes da raça holandês. Estas foram divididas em
Pesq. Vet. Bras.. Publicado em: 18/07/2019
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2. Risks associated to different methods of increasing pregnancy rate of cows in cow-calf systems
ABSTRACT This study assessed the risks of different management practices to increase pregnancy rate in beef cow-calf systems, aiming at assisting decision-making. The perception of 18 experts on animal sciences regarding the risks of 32 nutritional, breeding, and general management practices applied to increase pregnancy rate were evaluated through questionn
R. Bras. Zootec.. Publicado em: 29/11/2018
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3. Candidate mutations used to aid the prediction of genetic merit for female reproductive traits in tropical beef cattle
ABSTRACT In this study, we aimed to provide a wet laboratory validation for a set of single nucleotide polymorphisms (SNP), which had been identified as candidate functional variants in silico. Genotyping for candidate SNP was performed in Brahman and Tropical Composite cattle. After quality control, 29 SNP were first investigated individually for their asso
R. Bras. Zootec.. Publicado em: 29/11/2018
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4. Supplementation with a mixture of whole rice bran and crude glycerin on metabolic responses and performance of primiparous beef cows
ABSTRACT - This study investigated the effect of a supplement containing whole rice bran and crude glycerin for 21 days before mating on metabolic, productive, and reproductive responses of 28 primiparous suckling beef cows. Cows were randomly assigned to a control group (CON, n = 14), grazing on grasslands, and a supplemented group (SUP, n = 14), grazing on
R. Bras. Zootec.. Publicado em: 2016-01
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5. A survey of dairy calf management practices in some producing regions in Brazil
ABSTRACTThis study aimed to characterize the Brazilian dairy calves raising systems through a survey of major aspects of animal husbandry. One hundred seventy-nine producers and/or technicians were interviewed. The questionnaire addressed issues related to the management of the dry cow and the newborn, nutritional management of the liquid-feeding phase, hous
R. Bras. Zootec.. Publicado em: 2015-10
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6. Methodology to estimate the cost of delayed pregnancy for dairy cows. An example for Argentina
The objectives of the present study were to develop a methodology that implies the use of an electronic spreadsheet to calculate the financial losses of involuntary days open (IDO; every additional day open beyond an optimal calving-to-conception interval) and to show an example of the cost of days open using the proposed methodology. The costs accounted for
R. Bras. Zootec.. Publicado em: 2015-06
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7. Milk composition and its relationship with weaning weight in Charolais catte
To determine the effects of a number of non-genetic factors on milk components and estimate their indirect relationships with weaning weight (WW205), the percentages of protein, fat, lactose and solids non-fat in Charolais cows from Mexico were estimated. Lactation period (LP) and calving season (CS) had significant effects on protein and fat, whereas lactos
R. Bras. Zootec.. Publicado em: 2015-06
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8. Efficiency of calf production of cows from two genetic groups
The objective was to evaluate the effect of weight, age and production efficiency of cows from genetic groups based on the calf weight at calving and at weaning. For a period of five years, data of 120 cows (60 Angus-Nellore (AN) and 60 Simmental-Nellore (SN)) at four to nine-years of age were evaluated. All cows were maintained on Brachiaria decumbens pastu
R. Bras. Zootec.. Publicado em: 2014-07
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9. Reproductive efficiency of Nellore cows nursing Nellore or crossbred Simmental × Nellore calves
The objective of this study was to analyze the influence of genetic group (GG) of the calf during gestation, mobilization of body reserves and period of postpartum anestrus in Nellore cows. Thirty-seven primiparous and multiparous cows were used: 24 gave birth to Nellore (NEL), and 13 gave birth to ½ Simmental × ½ Nellore (SIM) calves. According to the da
R. Bras. Zootec.. Publicado em: 2013-07
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10. Metabolic, productive and reproductive responses to postpartum short-term supplementation in primiparous beef cows
The objective of this study was to evaluate the effect of a short-term supplementation with rice bran (2 kg/cows/day) on the endocrine and metabolic profiles and hepatic gene expression, associated with the reproductive response in beef cows in grazing conditions. Thirty-eight primiparous beef cows (Hereford, Angus and Hereford × Angus) were used in a rando
R. Bras. Zootec.. Publicado em: 2013-04
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11. Incorporation of lactations with non-conventional drying-off causes in genetic evaluation of Gyr dairy cattle
Test-day records of milk yields from the first three lactations were used to verify consequences of incorporation of lactation with non-conventional drying-off causes in genetic evaluation of Gyr dairy cattle. The first file (File1) was composed of test-day records of lactations with conventional drying-off causes. In the second file (File2), the test-day re
R. Bras. Zootec.. Publicado em: 2012-09
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12. Unitary input DEA model to identify beef cattle production systems typologies
The cow-calf beef production sector in Brazil has a wide variety of operating systems. This suggests the identification and the characterization of homogeneous regions of production, with consequent implementation of actions to achieve its sustainability. In this paper we attempted to measure the performance of 21 livestock modal production systems, in their
Pesqui. Oper.. Publicado em: 21/06/2012