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      Caracterização do gene do choque térmico (HSP-70.1) e sua relação com características de produção em bovinos leiteiros criados no semiárido brasileiro Translated title: [Characterization of the thermal shock gene (HSP-70.1) and its relationship with production characteristics in dairy cattle reared in the Brazilian semiarid]

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          Abstract

          RESUMO Objetivou-se com este trabalho avaliar a diversidade genética do gene HSP-70.1 e associar os polimorfismos encontrados com a performance de vacas leiteiras das raças Holandesa, Girolando (5/8H-G) e Sindi criadas em região do semiárido brasileiro. Os polimorfismos foram identificados e avaliados pela técnica de PCR-RFLP, usando-se a enzima de restrição EcoRII. Avaliou-se a variabilidade genética por meio do índice de diversidade padrão e da análise de variância molecular (AMOVA). Os polimorfismos identificados foram avaliados sobre as características de produção de leite. Foram identificados sete alelos, os quais demonstraram que houve polimorfismo para a região gênica analisada, e alguns alelos foram compartilhados entre os rebanhos. As raças bovinas Holandesa e Sindi foram similares geneticamente para o gene analisado. A AMOVA demonstrou que há variação genética entre os rebanhos e dentro deles, com a maior parte da variação ocorrendo dentro dos rebanhos para todos os grupos avaliados. Houve efeito dos alelos identificados sobre a produção de leite dos rebanhos das raças Holandesa (P<0,0001) e Girolando (P<0,0117). O gene HSP-70.1 foi polimórfico na população de bovinos leiteiros estudada, sendo, portanto, um marcador molecular promissor para avaliar a produção de leite de raças criadas em região semiárida.

          Translated abstract

          ABSTRACT The objective of this work was to evaluate the genetic diversity of the HSP-70.1 gene and to associate the polymorphisms found with the performance of Holstein, Girolando (5/8H-G) and Sindi dairy cows raised in region of the Brazilian semiarid. Polymorphisms were identified and evaluated using the PCR-RFLP technique using the EcoRII restriction enzyme. Genetic variability was evaluated using the standard diversity index and molecular variance analysis (AMOVA). The identified polymorphisms were evaluated on the characteristics of milk production. They were identified from the seven alleles, demonstrating that there was polymorphism for the analyzed gene region and some alleles were shared among the herds. The Holstein and Sindi bovine breeds were genetically like the analyzed gene. AMOVA demonstrated that there is genetic variation between and within the herds, with most of the variation occurring within the herds for all groups evaluated. There was effect of the alleles identified on the production of milk herds of Holstein and (P<0.0001) Girolando (P<0.0117) breeds. The HSP-70.1 gene was polymorphic in the population of dairy cattle studied, and therefore a promising molecular marker to evaluate milk production of breeds created in semiarid regions.

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            Mitochondrial diversity and the origins of African and European cattle.

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              Impaired reproduction in heat-stressed cattle: basic and applied aspects.

              Summer heat stress (HS) is a major contributing factor in low fertility in lactating dairy cows in hot environments. Although modern cooling systems are used in dairy farms, fertility remains low. This review summarizes the ways in which the functioning of various parts of the reproductive system of cows exposed to HS is impaired. The dominance of the large follicle is suppressed during HS, and the steroidogenic capacity of theca and granulosa cells is compromised. Progesterone secretion by luteal cells is lowered during summer, and in cows subjected to chronic HS, this is also reflected in lower plasma progesterone concentration. HS has been reported to lower plasma concentration of LH and to increase that of FSH; the latter was associated with a drastic reduction in plasma concentration of inhibin. HS impairs oocyte quality and embryo development, and increases embryo mortality. High temperatures compromise endometrial function and alter its secretory activity, which may lead to termination of pregnancy. In addition to the immediate effects, delayed effects of HS have been detected as well. Among them, altered follicular dynamics, suppressed production of follicular steroids, and low quality of oocytes and developed embryos. These may explain the low fertility of cattle during the cool autumn months. Hormonal treatments improve low summer fertility to some extent but not sufficiently for it to equal winter fertility. A limiting factor is the inability of the high-yielding dairy cow to maintain normothermia. A hormonal manipulation protocol, which induces timed insemination, has been found to improve pregnancy rate and to reduce the number of days open during the summer.
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                Author and article information

                Journal
                abmvz
                Arquivo Brasileiro de Medicina Veterinária e Zootecnia
                Arq. Bras. Med. Vet. Zootec.
                Universidade Federal de Minas Gerais, Escola de Veterinária (Belo Horizonte, MG, Brazil )
                0102-0935
                1678-4162
                May 2020
                : 72
                : 3
                : 985-992
                Affiliations
                [3] Recife Pernambuco orgnameUniversidade Federal Rural de Pernambuco Brazil
                [2] Recife Pernambuco orgnameInstituto Agronômico de Pernambuco Brazil
                [1] Garanhuns orgnameUniversidade Federal Rural de Pernambuco orgdiv1Programa de pós-graduação orgdiv2Unidade Acadêmica de Garanhuns Brazil
                Article
                S0102-09352020000300985 S0102-0935(20)07200300985
                10.1590/1678-4162-11147
                aac05f86-72d6-41af-9dcd-0a46819102d1

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 20 November 2019
                : 30 November 2018
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 23, Pages: 8
                Product

                SciELO Brazil

                Categories
                Zootecnia e Tecnologia e Inspeção de Produtos de Origem Animal

                Dairy cattle,EcoRII,Heat stress,PCR-RFLP,estresse por calor,bovinos leiteiros

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