Beef Cows
Mostrando 13-24 de 107 artigos, teses e dissertações.
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13. 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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14. The effects of intramuscular or intravenous injections of gonadotropin releasing hormone at fixed-time artificial insemination on pregnancy rates of Bos indicus beef cows
The effect of an intramuscular versus intravenous administration of gonadotropin releasing hormone (GnRH) at fixed-time AI (FTAI) on the pregnancy rates of crossbred Bos indicus beef cows was evaluated. Pluriparous nursing calv cows (n=120) were synchronized as follows: d 0 cows received a 2.0 mg injection of estradiol benzoate (EB) and insertion of a contro
Braz. arch. biol. technol.. Publicado em: 25/03/2014
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15. 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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16. Levels of supplementation for grazing pregnant beef cows during the dry season
The objective of this study was to evaluate the effect of different levels of multiple supplement supply on the nutritional characteristics and productive performance of pregnant cows grazing on Brachiaria decumbens Stapf. during the dry season. The experimental area was composed of four 3.0 ha paddocks with availability of potentially digestible dry matter
R. Bras. Zootec.. Publicado em: 2012-12
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17. Association of polymorphisms in the leptin and thyroglobulin genes with meat quality and carcass traits in beef cattle
The objective of the present study was to estimate the allelic and genotypic frequencies of the polymorphisms E2FB (AY138588.1: c.305C> T), located in the leptin gene (LEP), and TG5 (X05380.1:g.-422C>T), located in the thyroglobulin gene (TG), and evaluate the association of these polymorphisms in crossbred cattle of seven distinct genetic groups with the fo
R. Bras. Zootec.. Publicado em: 2012-10
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18. Trichomonas vaginalis and Tritrichomonas foetus: interaction with fibroblasts and muscle cells - new insights into parasite-mediated host cell cytotoxicity
Trichomonas vaginalis and Tritrichomonas foetus are parasitic, flagellated protists that inhabit the urogenital tract of humans and bovines, respectively. T. vaginalis causes the most prevalent non-viral sexually transmitted disease worldwide and has been associated with an increased risk for human immunodeficiency virus-1 infection in humans. Infections by
Mem. Inst. Oswaldo Cruz. Publicado em: 2012-09
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19. Comparison between deep intracornual artificial insemination (dIAI) and conventional artificial insemination (AI) using low concentration of spermatozoa in beef cattle
This study aimed to compare the pregnancy rate using the conventional artificial insemination (AI) or deep intracornual artificial insemination (DIAI), with low number of spermatozoa (4.0 million sperm) in 270 Nelore cows. The animals were divided in two groups (G: G1 (135 cows) conventional AI was performed (=semen deposition in the uterine body) and in G2
Brazilian Archives of Biology and Technology. Publicado em: 2012-06
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20. Effect of the ovulatory follicle diameter and progesterone concentration on the pregnancy rate of fixed-time inseminated lactating beef cows
The objective of this study was to evaluate the influence of the ovulatory follicle diameter on the reproductive performance of lactating beef cows subjected to low progesterone fixed-time artificial insemination (FTAI) protocols. Ninety-three lactating beef cows (60-80 days postpartum) at random stages of estrous cycle were given a luteolytic dose of prosta
Revista Brasileira de Zootecnia. Publicado em: 2012-04
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21. Breeding objectives and economic values for traits of low input family-based beef cattle production system in the State of Rio Grande do Sul
The objectives of this study were to define breeding objectives and derive economic weights for production traits in family-based beef cattle systems, assess the sensitivity of these weights to changes in market and husbandry indicators and estimate the expected genetic changes in the selection criteria proposed. Based on data from the production systems, fa
Revista Brasileira de Zootecnia. Publicado em: 2012-02
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22. ROTA DE AÇÃO DA PROSTAGLANDINA F2 ADMINISTRADA VIA SUBMUCOSA VULVAR NA LUTEÓLISE DE BOVINOS / ROUTE OF ACTION OF PROSTAGLANDIN F2 AFTER INTRAVULVOSUBMUCOUS INJECTION IN BOVINE LUTEOLYSIS
The aim of this study was to verify if prostaglandin F2 (PGF2) administered by intravulvosubmucous (IVSM) injection induces luteolysis by reaching the corpus luteum (CL) directly by a local absorption rote, preventing its metabolism in the lungs, or after absorption and distribution via the systemic circulation. In a first trial, the estrus rate of 1,937 bee
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/09/2011
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23. Níveis de suplementação para fêmeas bovinas de corte em pastejo / Levels of supplementation for grazing beef cattle female
This thesis was developed from four experiments with crossbred female with predominance of Zebu breed exposed to different levels of supply multiple supplementation on pasture. The objective of first experiment was to evaluate the effect of providing different levels of multiple supplement on the nutritional characteristics and productive performance of heif
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/08/2011
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24. Estratégias de suplementação para vacas e para novilhas de corte dos quatro aos dezoito meses de idade / Supplementation strategies for cows and beef heifers from four to eighteen months old
Foram realizados três experimentos com o objetivo de avaliar Estratégias de suplementação para vacas e para novilhas de corte dos quatro aos dezoito meses de idade. No primeiro experimento objetivou-se avaliar o desempenho produtivo, o consumo de pasto, bem como consumo e digestibilidade dos nutrientes ingeridos por novilhas Nelore ou mestiça, com predo
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/08/2011