Fatores genéticos e de meio na produção de leite de caprinos leiteiros

Gonçalves, Heraldo César; Silva, Martinho de Almeida e; Wechsler, Francisco Stéfano; Ramos, Alcides de Amorim

doi:10.1590/s1516-35982001000300017

Cited by 21 publications

(20 citation statements)

References 16 publications

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“…Exploring the influence of variations in the ambience on dairy goat breeds, such as Alpine, Saanen, Toggenburg, and Anglo-Nubiana, is necessary, because they are the main breeds from temperate regions that are utilized in tropical regions (Gonçalves et al, 2001). In relation to male goats, greater knowledge of their reproductive variations during the year can help with breeding and husbandry decisions.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variation in the reproductive activity of male goats raised under tropical climate conditions

et al. 2017

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-This study analyzed seasonal variations in the testes, the concentration of sex hormones, the parameters of fresh and thawed semen, and the sexual behavior of male Alpine goats from a temperate region in a tropical climate and possible interference with fertility. The maximum and minimum temperature and luminosity were recorded daily, while seminal, hormonal, and behavioral assessments were carried out every fortnight. The maximum and minimum temperature (°C) and luminosity (h) were recorded daily always at 17.00 h. The scrotal circumference (cm), testicular volume (mL), volume (mL), appearance (creamy, milky, aqueous) and coloration (white, white-yellowish, and yellowish) seminal, turbulence or mass movement (0 to 5), progressive spermatic motility (0 to 100%), spermatic force (0 to 5), concentration (spermatozoids/mL), spermatic pathologies, hypoosmotic test (%), serum levels of FSH (mUI/mL), LH (mUI/mL), testosterone (ng/mL), and sexual behaviors were carried out every fortnight. There was a difference between the scrotal circumference evaluated monthly, testicular volume, volume and concentration of fresh semen, sperm vigor of the thawed semen, serum levels of testosterone, FSH and LH, and some sexual behaviors. Thus, the changes that occur in the quantity and quality of sperm, in the hormonal profile, and in sexual behaviors should not be regarded as an impediment to the use of male Alpine goats in tropical climates throughout the year. These variations do not lead to changes in the semen that may compromise the fertility of these animals.

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Section: Introductionmentioning

confidence: 99%

Seasonal variation in the reproductive activity of male goats raised under tropical climate conditions

et al. 2017

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“…O resultado obtido para idade da cabra ao parto em relação à PL é biologicamente correto, uma vez que a cabra aumenta sua produção até certa idade e tende a decrescer, descrevendo uma função quadrática, o que está de acordo com a maioria dos trabalhos encontrados na literatura, como os de Mourad (1992) e Gonçalves et al (2001). A equação e respectiva curva de regressão da produção de leite, em função da idade ao parto, encontram-se na Figura 1.…”

Section: Resultsunclassified

“…No Brasil, a maioria das pesquisas tem sido realizada com cabras originadas de clima temperado, como os trabalhos realizados por Gonçalves et al (2001), com cabras das raças Saanen, Alpina e Toggenburg, que obtiveram estimativa de herdabilidade para produção de leite de 0,29 ± 0,07, e Soares Filho et al (2001), que, ao trabalharem com as mesmas raças na região centro-oeste do país, encontraram herdabilidade de 0,06; 0,12 e 0,11, respectivamente.…”

Section: Introductionunclassified

Efeitos genéticos e ambientais que afetam a produção de leite e duração da lactação de cabras mestiças no estado da Paraíba

Filho

Sarmento²,

Ribeiro

2004

R. Bras. Zootec.

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RESUMO -Utilizaram-se dados de 689 lactações de 225 cabras Pardo Alpina x Gurguéia filhas de 18 bodes, controladas de 1988 a 1996, criadas na Fazenda Carnaúba, Taperoá-PB, com os objetivos de estudar os efeitos ambientais e estimar parâmetros genéticos para as características produção de leite (PL) e duração da lactação (DL). Os efeitos ambientais foram estimados por meio de um modelo estatístico que incluiu o efeito aleatório de bode, os efeitos fixos de grupo contemporâneo, tipo de parto e idade da cabra ao parto e duração da lactação, para PL, como covariáveis. Os parâmetros genéticos foram estimados por intermédio do programa MTDFREML, sob modelo animal, contendo os efeitos fixos e covariáveis utilizados no modelo anterior. As características foram influenciadas pelo efeito fixo de grupo contemporâneo. A idade da cabra influenciou apenas a característica PL. As médias obtidas para PL e DL foram 257,71 ± 54,73 kg e 185,56 ± 46,87 dias, respectivamente, equivalendo à produção média diária de 1,38 kg de leite/dia. As estimativas de herdabilidade e repetibilidade foram, respectivamente, de 0,23 e 0,35 para PL e 0,20 e 0,24 para DL. A correlação genética estimada entre as características foi de 0,96. Em razão de as herdabilidades das características serem de média magnitude e limitadas ao sexo, sugerese o teste de progênie como método de seleção mais eficaz para os bodes.Palavras-chave: caprinos leiteiros, nordeste, parâmetros genéticos, semi-árido Genetic and Environmental Effects that Affect Milk Production and Lactation Length of Crossbred Goats in the State of ParaibaABSTRACT -Records of 689 lactations of 225 Alpine x Gurguéia goats, progenies of 18 buck, controlled from 1988 to 1996, raised at Carnaúba Farm, Taperoá-PB, were analyzed with the objective of study environmental effects and estimate genetics parameters for Milk Production (MP) and Length of Lactation (LL). The environmental effects were analyzed by an statistical model that included buck random effects and the fixed effects of contemporary groups, type of kidding and age of dam at kidding and length lactation as covariate. The genetic parameters were estimated using MTDFREML program, under animal model, including fixed effects and covariates through a described model before. The traits were influenced by contemporary groups. The age of dam at kidding influenced only MP trait. The means for MP and LL were 257.72 ± 54.73 kg and 185.54± 46.87 days, respectively, giving a daily mean production of 1.38 kg of milk/ day. The heritability and repeatability estimates were, respectively, 0.23 and 0.35 for MP and 0.20 and 0.24 for LL. The genetic correlation estimate between MP and LL was 0.96. Due to the traits heritability are of average magnitude and sex-limited, it is suggested to use the progeny test as method of more effective selection for bucks.

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“…Of these, two have distinct peculiarities, for the production of milk and goats: i) the Northeast region (SE, BA, RN, AL, MA, PE, PB, EC, PI), markedly different, due to a high number of goats with low individual milk production in extensive production systems; ii) Southeast (SP, MG, RJ and ES), using animals specialized for milk production, in intensive systems (Gonçalves et al 2001(Gonçalves et al , 2008. These tests also revealed which climate and socioeconomic variables were most important for production in the different regions.…”

Section: Multivariate Approachmentioning

confidence: 99%

“…In southeastern Brazil, the animals are raised mostly in conϐinement (Gonçalves et al 2001, Barros et al 2005. Goat production is inϐluenced by factors such as local vegetation (Skonhoft et al 2010), average air temperature (McManus et al 2010) and altitude (Campbell et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Spatialization of climate, physical and socioeconomic factors that affect the dairy goat production in Brazil and their impact on animal breeding decisions

et al. 2012

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1073 em melhoramento animal.] O Brasil possui diversidade edafoclimática e realidades socioeconômicas e políticas distintas. Isto contribui para diferenciar as regiões polí-tico administrativas do país. Objetivou-se espacializar os fatores ϐísicos, climáticos e socioeconômicos que melhor discriminam a produção de caprinos leiteiros no Brasil. Foram analisados índice de produção de leite por cabra; ín-dice de produção de caprinos; índice de produção de leite, amplitude da temperatura; temperatura média; precipitação; índice normalizado de diferença vegetativa; umidade relativa do ar; altitude; estabelecimentos agropecuários; estabelecimentos com pastagem nativa; estabelecimentos com pastagens de boa qualidade; estabelecimentos com recursos hídricos; estabelecimentos que recebem orientação técnica; estabelecimentos de agricultura familiar; estabelecimentos de agricultura não familiar e índice de desenvolvimento humano. Brazil has high climate, soil and environmental diversity, as well as distinct socioeconomic and political realities, what results in differences among the political administrative regions of the country. The objective of this study was to determine spatial distribution of the physical, climatic and socioeconomic aspects that best characterize the production of dairy goats in Brazil. Production indices of milk per goat, goat production, milk production, as well as temperature range, mean temperature, precipitation, normalized difference vegetation index, relative humidity, altitude, agricultural farms; farms with native pasture, farms with good quality pasture, farms with water resources, farms that receive technical guidance, family farming properties, non-familiar farms and the human development index were evaluated. The multivariate analyses were carried out to spatialize climatic, physical and socioeconomic variables and so differenciate the Brazilian States and Regions. The highest yields of milk and goat production were observed in the Northeast. The Southeast Region had the second highest production of milk, followed by the South, Midwest and North. Multivariate analysis revealed distinctions between clusters of political-administrative regions of Brazil. The climatic variables were most important to discriminate between regions of Brazil. Therefore, it is necessary to implement animal breeding programs to meet the needs of each region.

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Fatores genéticos e de meio na produção de leite de caprinos leiteiros

Cited by 21 publications

References 16 publications

Seasonal variation in the reproductive activity of male goats raised under tropical climate conditions

Seasonal variation in the reproductive activity of male goats raised under tropical climate conditions

Efeitos genéticos e ambientais que afetam a produção de leite e duração da lactação de cabras mestiças no estado da Paraíba

Spatialization of climate, physical and socioeconomic factors that affect the dairy goat production in Brazil and their impact on animal breeding decisions

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