Sex Of Cows
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. In vitro sperm characteristics and in vivo fertility of sex-sorted and conventional semen in suckled Nelore cows at a traditional schedule for timed-AI with estrus detection
RESUMO O estudo teve como objetivo avaliar características espermáticas in vitro e a taxa de concepção (TC) de sêmen convencional e sexado em um programa de IATF tradicional de vacas Nelore pós-parto. Todas a vacas (n=348) foram submetidas ao mesmo protocolo de IATF à base de estradiol e de progesterona. Após 48 horas da retirada do implante, foi det
Arquivo Brasileiro de Medicina Veterinária e Zootecnia. Publicado em: 2022
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2. Factors affecting the selling prices of calves in auctions in Santa Catarina State, Brazil
ABSTRACT The objective of this study was to investigate the effects of genetic group and calf sex on selling prices in auctions in the state of Santa Catarina (SC), Brazil. We evaluated 33,143 animals, representing 3,587 lots in 47 auctions from 2009 to 2014. The calves were classified according to genetic groups: British breed or crossbreed (BX); Continenta
R. Bras. Zootec.. Publicado em: 2016-10
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3. Use of sex-sorted and unsorted frozen/thawed sperm and in vitro fertilization events in bovine oocytes derived from ultrasound-guided aspiration
The objective was to investigate the effects of sex-sorting on early fertilization events in ovum pick up (OPU) derived oocytes fertilized in vitro with frozen-thawed sperm at different co-incubation lengths. Eighty-four OPU sessions were carried out in 18 cyclic, dry and non-stimulated Holstein Friesian and German black pied cows. Ovum pick up oocytes were
R. Bras. Zootec.. Publicado em: 2013-10
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4. Sensibilidade da PCR na amplificação do DNA bovino em diluição seriada e mistura de amostra macho e fêmea
A mixture of bovine DNA from a male and a female Jersey (Bos taurus taurus) bred in different proportions was used to determine the sensitivity of PCR to amplify and discriminate the bovine DNA samples. Samples were obtained from the peripheral blood of a bull and a heifer and DNA was isolated using a commercial kit for extraction and purification of nucleic
Arquivo Brasileiro de Medicina Veterinária e Zootecnia. Publicado em: 2011-08
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5. Herdabilidade da idade ao primeiro parto de vacas da raça Canchim.
Foram estudadas as idades ao primeiro parto de 233 vacas 5/8 Charolês- 3/8 Zebu e 266 vacas canchim, criadas nas fazendas São Jorge e Guará, situadas, respectivamente nos municípios de cedral e Guzolândia, no Estado de São Paulo.
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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6. Efeito do intervalo entre a inseminação e a ovulação na taxa de concepção de vacas Nelore inseminadas em tempo fixo com sêmen sexado / Effect of interval between insemination and ovulation in conception rates in Nelore cows timed AI with sex-sorted semen
A identificação do momento mais apropriado para realizar a inseminação artificial em tempo fixo (IATF) utilizando sêmen sexado pode aumentar a prenhez por inseminação (P/IA) e aumentar a utilização do sêmen sexado em fazendas de corte. Este trabalho teve por objetivo avaliar o melhor intervalo entre a inseminação e a ovulação na P/IA de vacas N
Publicado em: 2010
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7. EFEITOS DA INCLUSÃO DE ÁCIDOS GRAXOS INSATURADOS NO SUPLEMENTO DE VACAS PRIMÍPARAS ZEBUÍNAS SOBRE O DESEMPENHO PRODUTIVO E REPRODUTIVO / Effects of inclusion of unsatured fatty acids in the supplement of primiparous cows zebuine on productive and reproductive performance
Were used primiparous cows, zebuine, calved than received in the postpartum period, low intake isoenergetic supplements, in pasture of Brachiaria brizantha cv. Marandu, with twenty cows per treatment in a randomized design, where FA: the low intake supplement (LIS) with inclusion of protected fat, CO: LIS with the inclusion of meal corn and MS: only mineral
Publicado em: 2009
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8. EFEITOS DA INCLUSÃO DE ÁCIDOS GRAXOS INSATURADOS NO SUPLEMENTO DE VACAS PRIMÍPARAS ZEBUÍNAS SOBRE O DESEMPENHO PRODUTIVO E REPRODUTIVO / Effects of inclusion of unsatured fatty acids in the supplement of primiparous cows zebuine on productive and reproductive performance
Were used primiparous cows, zebuine, calved than received in the postpartum period, low intake isoenergetic supplements, in pasture of Brachiaria brizantha cv. Marandu, with twenty cows per treatment in a randomized design, where FA: the low intake supplement (LIS) with inclusion of protected fat, CO: LIS with the inclusion of meal corn and MS: only mineral
Publicado em: 2009
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9. Disenteria de inverno: detecção de coronavírus bovino (BCoV) por reação de PCR dirigida ao gene Rp Rd e isolamento em cultivo celular de HRT-18G / Winter dysentery: detection of bovine coronavirus (BCoV) by RT-PCR for the Rp Rd gene and isolation in monolayers of HRT-18G cells
Bovine coronavirus (BCoV), a member of Coronaviridae family, causes severe diarrhea in newborn calves and has been associated with outbreaks of winter dysentery (WD) in adult cattle in several countries, including Brazil. The morbidity rate of WD is very high (50-100%) and the disease causes severe economic losses once it decreases milk production. The aim o
Publicado em: 2007
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10. Passagem celular, sexo e transcrição X-específica interferem no desenvolvimento embrionário e fetal de bovinos produzidos por transferência nuclear / Celular passage, sex and X-specific transcription interfere in bovine nuclear transfer embryo and fetal development
Cells cultured for long-term periods accumulate genetic and epigenetic modifications that result in improper nuclear reprogramming of somatic cell nuclear transfer (SCNT) embryos. Furthermore, the sex may be a limiting factor in blastocysts production and in post-implantation developmental competence. Therefore, the objective of this study was to determine t
Publicado em: 2007
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11. Effects of cytoplasmic inheritance on preweaning traits of Hereford cattle
The influence of cytoplasmic inheritance on birth and weaning weight was evaluated in an experimental Hereford herd. Data on 1,720 records for birth and weaning weights from calves born between 1963 and 2002 were studied. Variance components were estimated using MTDFREML procedures and an animal model was fitted for each trait. Direct and maternal additive e
Genetics and Molecular Biology. Publicado em: 2005-09
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12. Aplicação de modelos multiníveis na análise de dados de medidas repetidas no tempo. / Multilevel models applied in the analysis of repeated measure data.
It is common to and data structured in a hierarchical form in several scientific works, that is, the studied subjects are nested in the lowest level unites, that belong to the highest level unites, and so on. To analyze these sort of data it is important to take in account the hierarchical structure once, if does not do it, the coeficients can be overestimat
Publicado em: 2002