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Estimation of genetic and phenotypic trends for dairy traits of Gyr and Guzerá breeds Animal Sciences
Rangel, Adriano Henrique do Nascimento; Araújo, Thalita Polyana Monteiro; Lima, Guilherme Ferreira da Costa; Borba, Luiz Henrique Fernandes; Peixoto, Maria Gabriela Campolina Diniz; Lima Júnior, Dorgival Morais de.
 Milk production has high economic importance in dairy cattle production systems, which justifies its inclusion in genetic breeding programs. The objective of this study was to evaluate the genetic and phenotypic trends of dairy traits in Gyr (167 lactations) and Guzerá (148 lactations) breeds in the State of Rio Grande do Norte (RN). Milk, fat and protein production obtained from monthly dairy controls were the traits evaluated. The expected differences in progeny (DEPs) for these traits were estimated using an animal model. From the means of phenotypic values and DEPs, we estimated the genetic and phenotypic trends in linear regressions as a function of the year of calving of the animal. Positive genetic and phenotypic trends were observed for Gyr (26.8...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Genetic progress; Milk production; Selection; Zebu..
Ano: 2017 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/36685
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Gir and Guzerat cow milk production and composition according to lactation stage, somatic cell count, physiological state and body condition Animal Sciences
Araújo, Thalita Polyana Monteiro; Rangel, Adriano Henrique do Nascimento; Lima, Guilherme Ferreira da Costa; Peixoto, Maria Gabriela Campolina Diniz; Urbano, Stela Antas; Bezerra, Joadilza da Silva.
 This work was realized to evaluate lactation stage, physiological state, somatic cell count (SCC) and body condition score (BCS) on production and composition of cow's milk from Gir and Guzerat breeds were studied. Ninety-eight cows were analyzed and classified according to their physiological state, lactation stage, SCC and BCS. Milk production was weighed monthly to obtain production data. Composed samples were collected in vials containing preservatives and sent to the laboratory for analysis. Data were used for statistic descriptive analysis and analysis of variance. Higher milk production in the first 60 days of lactation was observed. Fat, protein and total solids concentration increased according to the increase of days in milk; while lactose...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 5.04.05.02-0 gestation; Milk quality; Body reserve; Zebu..
Ano: 2018 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/39352
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Influence seasons of the year and somatic cell counts on physical-chemical and sensory parameters of milk and coalho cheese Animal Sciences
Lima, Edine Roberta de; Oliveira, Juliana Paula Felipe de; Bezerra, Maria de Fátima; Borba, Luis Henrique Fernandes; Bezerra, Joadilza da Silva; Rangel, Adriano Henrique do Nascimento.
 The objective of this study was to evaluate the influence seasons of the year and somatic cell counts (SCC) on physical-chemical and sensory parameters of cow’s milk from individual and collective refrigeration tanks with different milking systems. In addition to analyzing the sensory acceptance of pasteurized milk and coalho cheese developed with high (> 800,000 cells mL-1) and low SCC levels (<200,000 cells mL-1). Seasonality did not affect fat content, casein, lactose, total solids, defatted dry extract and SCC, but lower protein levels than May and June were observed from July to September. Based on the SCC results, milk from refrigeration tanks was classified as low SCC and high SCC. The samples were used to obtain pasteurized milk and coalho...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Qualidade do leite; Análise sensorial dairy products; Mastitis; Milk composition; Milk quality; Refrigeration tank; Shelf life..
Ano: 2019 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/44666
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