Grupo genético e nível nutricional pós-parto na produção e composição do leite de vacas de corte

Restle, João; Pacheco, Paulo Santana; Moletta, José Luiz; Brondani, Ivan Luiz; Cerdótes, Liliane

doi:10.1590/s1516-35982003000300010

Cited by 40 publications

(55 citation statements)

References 20 publications

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“…Studies show the benefits of using crossbreeding to reduce the age of puberty as well as for the subsequent reproductive performance in beef cows (RESTLE et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Performance of beef cows of different genetic groups in natural and cultivated pastures

et al. 2016

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“…Studies show the benefits of using crossbreeding to reduce the age of puberty as well as for the subsequent reproductive performance in beef cows (RESTLE et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Performance of beef cows of different genetic groups in natural and cultivated pastures

et al. 2016

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“…Previous studies have shown no effect of calf sex on milk production (ESPASANDIN et al, 2001); higher production in cows nursing females (RODRIGUES, 2012;HINDE et al, 2014), in cows nursing males (RESTLE et al, 2003), and in cows nursing heavier calves, regardless of sex (RUTLEDGE et al, 1971;ROBISON et al, 1978;PIMENTEL et al, 2006); and yearly alternation between the sexes. JEFFERY et al (1971) demonstrated an interaction between the year and the sex of the calf in terms of milk production, with a greater yield in heifers that calved females.…”

Section: Resultsmentioning

confidence: 94%

“…The age of the heifer at the time of calving is one of the main factors affecting milk production and significantly influences P305 (P < 0.01) (TEODORO et al, 2000;RESTLE et al, 2003;RANGEL et al, 2009). A greater degree of physiological maturity, which is related to the development of the mammary gland (REECE, 2007) and also to body size, results in higher milk production due to the greater capability for food intake (RAIDAN et al, 2015).…”

Section: Resultsmentioning

confidence: 99%

Fetal sex influence in the productive performance of dairy cows

Freitas

Gama

Santos

et al. 2016

SCA

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Investigating factors that could affect milk production of cows is an important way to improve the efficiency of production systems. The purpose of this study was to verify and quantify the influence of calf sex on milk production and lactation length in herds of Holstein, Gir, and Guzera cows. Data from 10,780 lactations of 4,807 Holstein cows that calved between 2001 and 2013; 18,898 lactations of 13,172 Gir cows that calved between 1985 and 2013; and 5,277 lactations of 3,972 Guzera cows that calved between 1987 and 2013 were used. Both the accumulated 305-day milk yield (P305) and the length of the lactation period up to 305 days (DL305) were evaluated. Analysis of variance was performed by the least squares method using the GLM procedure in the SAS statistical program. The P305 was not influenced by the sex of the calf in the Holstein breed. However in the zebu breeds (Gir and Guzera), both P305 and DL305 were significantly affected (P < 0.01) by the sex of the calf, with higher production and average length of lactation in cows that calved males. In addition, a significant difference was also nested within sex of calf and age at first calving (P < 0.05) in the Gir breed. The results indicate that for the zebu breeds, calf sex influences production characteristics. Key words: Milk production. Lactation. Lactation length. ResumoA investigação de fatores que interferem na produção de vacas leiteiras é de grande importância para eficiência dos sistemas de produção. O objetivo do trabalho foi verificar e quantificar a influência do sexo do bezerro sobre produção de leite e sobre a duração da lactação em rebanhos das raças Holandesa, Gir Leiteiro e Guzerá. ocorridas entre 1987 e 2013, de 3.972 vacas Guzerá. As características estudadas foram produção de leite acumulada em 305 dias e duração da lactação (até 305 dias). A análise de variância foi realizada pelo método de quadrados mínimos, através do procedimento GLM do programa estatístico SAS. A produção de leite acumulada aos 305 dias (P305) na raça Holandesa não foi influenciada pelo sexo do bezerro. Entretanto, para os animais de origem zebuína (Gir leiteiro e Guzerá), ambas as características foram significativamente influenciadas (P<0,01) pelo sexo do bezerro, sendo observadas maiores produções de leite e duração de lactação para vacas que pariram machos. Também foi observada diferença significativa do sexo do bezerro aninhado dentro de idade da vaca ao parto (P<0,05) para a raça Gir leiteiro. Estes resultados indicam que para as raças zebuínas, o sexo do bezerro influenciou as características de produção. Palavras-chave: Produção de leite. Lactação. Duração da lactação.

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“…All analyzed variables except for casein from total protein were influenced (P <0.05) by the production system used in the production unit. The literature reports that environmental factors such as the age at calving, calving month, lactation stage and the nutritional level of the animals all have an influence on milk composition (RESTLE et al, 2003;NORO et al, 2006). Therefore, knowing that these factors undergo great variation within each production unit, it is possible to understand the variation in milk composition shown in Table 3.…”

Section: Resultsmentioning

confidence: 99%

Quality indicators of tank milk in different production systems of tropical regions

Campos

Rangel

Borba

et al. 2016

SCA

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Research was conducted in eight commercial herds located in the state of Rio Grande do Norte, Brazil. Properties were classified according to the production system, the seasons were divided into four and the genetic groups into six. Milk samples from morning milking were collected monthly, directly from a cooling tank. Protein, fat, lactose, total solids, casein, urea nitrogen concentrations/levels, somatic cell count (SCC) and total bacterial count (TBC) were determined. For milk composition, the detected results were satisfactory and met the requirements of Normative Ruling 62, but the averages for SCC and TBC were above the recommended limit. All variables, with the exception of casein from total protein were influenced (P <0.05) by the production system used in the production unit. A lower fat content was recorded in 2010 compared to 2011. For the seasons, all the constituents of milk had lower values in drier season (seasons 3 and 4), with the exception of casein; SCC and TBC had higher values in periods 1 and 2, which are considered rainy periods. There was variation in the chemical composition of milk according to the genotypes. Milk chemical composition met the legal and market requirements, with a positive emphasis on specialized production systems. The variations over the year and according to the genetic group of the herd are also significant and should be taken into account in the search for improvements. As for the hygiene and health aspects of milk, the results portray the need for a greater focus by the entities involved in the sector, as well as the producers, on the viability of an adequacy program and monitoring of management practices related to this criterion. Campos, P. P. L. da E. et al.do tanque de resfriamento, amostras de leite na ordenha da manhã. Foram determinados os teores de proteína, gordura, lactose, sólidos totais, caseína, as concentrações de nitrogênio ureico, a contagem de células somáticas (CCS) e a contagem bacteriana total (CBT). Para a composição do leite, os resultados detectados foram satisfatórios e atenderam às exigências previstas na Instrução Normativa 62, mas as médias obtidas para CCS e CBT estão acima do limite recomendado. Todas as variáveis analisadas, com exceção da caseína da proteína total, foram influenciadas (P<0,05) pelo sistema de produção utilizado na unidade produtiva. Verificou-se menor teor de gordura em 2010, quando comparado a 2011. Para as estações do ano, com exceção da caseína, todos os constituintes do leite apresentaram menores valores na época mais seca (estações 3 e 4), já a CCS e CBT apresentaram maiores valores nas épocas 1 e 2, que são considerados períodos de chuva. Verificou-se variação na composição química do leite de acordo com os genótipos estudados. A composição química do leite atende às exigências legais e de mercado, com destaque positivo para os sistemas de produção especializados. As variações ao longo do ano e de acordo com o grupo genético do rebanho são também significantes, devendo ser levadas em consideração na bus...

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Grupo genético e nível nutricional pós-parto na produção e composição do leite de vacas de corte

Cited by 40 publications

References 20 publications

Performance of beef cows of different genetic groups in natural and cultivated pastures

Performance of beef cows of different genetic groups in natural and cultivated pastures

Fetal sex influence in the productive performance of dairy cows

Quality indicators of tank milk in different production systems of tropical regions

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