Efeito da composição genética e de fatores de meio sobre a produção de leite, a duração da lactação e a produção de leite por dia de intervalo de partos de vacas mestiças Holandês-Gir

Glória, Joana Ribeiro da; Bergmann, J.R.; Reis, R.B.; Coelho, Maria Alice Zarur; Silva, S. Ravi P.

doi:10.1590/s0102-09352006000600024

Cited by 17 publications

(8 citation statements)

References 4 publications

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“…The time required to reach peak production did not differ between groups, but the average number of days necessary for the ½ HG and ¾ HG groups to reach the peak was higher (Table 1) than the 21 days obtained by Glória et al (2010) for pluriparous ½ HG cows. In addition, lactation length was longer for the ≥⅞ HG than for the ½ HG group, because animals with a higher percentage of zebu genes have a shorter lactation length (Glória et al, 2006). The total lactation production of ¾ HG and ≥⅞ HG cows was greater than that of ½ HG, showing that the higher the Gyr proportion in the crossing, the greater the chance of reduced milk production, as also reported by McManus et al (2008).…”

Section: Resultssupporting

confidence: 61%

Metabolic and hormone profiles of Holstein x Gyr cows during pre- and postpartum

Franzoni

Glória

Costa

et al. 2018

Pesq. agropec. bras.

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The objective of this work was to describe the effect of genetic composition on body condition score (BCS), on total lactation production, and on metabolic and hormone profiles of Holstein x Gyr cows under the same pre- and postpartum management conditions. The genetic groups ½ (n=8), – (n=10), and ≥⅞ (n=10) Holstein x Gyr (HG) were evaluated within the same farm, and all of them showed typical lactation curves. The time required to reach peak production did not differ between groups. The groups also did not differ as to time to reach the lowest BCS after calving or to recover BCS after calving, nor as to their BCS values in the week of first ovulation, number of weeks required for first ovulation, and service period. However, ½ HG cows had higher BCS at calving, but also greater BCS loss postpartum. Total lactation production and plasma insulin concentrations of – HG cows postpartum were similar to those of cows specifically selected for milk production. Using parameters obtained with Holstein cows to determine management conditions in farms with crossbred cows can have unwanted consequences, since these animals have different metabolic and hormone profiles.

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Section: Resultssupporting

confidence: 61%

Metabolic and hormone profiles of Holstein x Gyr cows during pre- and postpartum

Franzoni

Glória

Costa

et al. 2018

Pesq. agropec. bras.

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“…Also, as the size of the property increased, the period between dry-off and the date of calving increased due to the breed pattern of the cows (Gyr × Holstein crossbred) and the lower persistence of lactation. Generally, animals with a greater percentage of genes from the Gyr breed have a shorter lactation period (Glória et al, 2006). When the criteria for drying was daily milk production, the minimum milk production to maintain lactating cows was 5 L for 59% of the properties, and between 15 and 20 L for 13% of the interviewees.…”

Section: Resultsmentioning

confidence: 99%

A survey of dairy calf management practices in some producing regions in Brazil

Santos

Bittar

2015

R. Bras. Zootec.

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-This study aimed to characterize the Brazilian dairy calves raising systems through a survey of major aspects of animal husbandry. One hundred seventy-nine producers and/or technicians were interviewed. The questionnaire addressed issues related to the management of the dry cow and the newborn, nutritional management of the liquid-feeding phase, housing, and health management. A third of newborn calves stay with their mothers for more than 24 h after delivery, and only 56% of the calves receive colostrum within the first 8 h of life. Four out of ten producers allow the calf to suckle colostrum directly from the mother. Regarding the liquid diet, 44 and 35% of the farms provide marketable milk and discard milk for the calves, respectively. It was possible to identify several areas of improvement in the raising system; for instance, greater attention could be given to dry cows and the monitoring of births and to the establishment of adequate protocols to evaluate colostrum quality and feeding management.

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“…Soares Júnior (2012) Glória et al (2006) observaram um efeito curvilíneo da idade ao parto sobre a produção de leite por dia de intervalo de partos de vacas 1/2 Holandês-Gir, com previsão de produção máxima para seis anos e quatro meses, com a vaca na terceira ou quarta lactação.…”

Section: Resultsunclassified

Características produtivas da lactação de quatro grupos genéticos F1 Holandês x Zebu

Ruas¹,

Silva²,

Queiroz³

et al. 2014

RBCV

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ResumoEstudou-se a lactação de vacas F1 Holandês x Gir, Holandês x Guzerá, Holandês x Azebuado e Holandês x Nelore em nove ordens de partos obtida em duas ordenhas diárias. Analisou-se a produção média diária, o pico de lactação, o dia em que ocorreu o pico e a proporção da produção na primeira e segunda ordenha diária. O sistema de produção, no qual os animais foram criados, utilizava-se de pastagens de Brachiaria decumbens e Brachiaria brizanta como alimentação volumosa na época das chuvas e silagem de milho e ou cana-de-açúcar como suplementos na época da seca. A ração concentrada foi fornecida de acordo com a produção leiteira. Observou-se que todas as características avaliadas foram diretamente influenciadas pela ordem de partos e base materna. Dentre os resultados encontrados, destaca-se que a produção média diária de leite das vacas F1 Holandês x Gir e Holandês x Azebuado foram maiores e similares entre si, enquanto as vacas F1 Holandês x Guzerá e Holandês x Nelore tiveram menores produções e também foram similares entre si. Conclui-se que todos os grupos genéticos podem ser utilizados para a produção de leite por apresentarem produções médias diárias superiores a 10 kg/vaca/dia, sendo compatíveis com a produção de leite em pasto.Palavras-chave: animais mestiços, cruzamentos, ordenha, pico de lactação, pastagem, produção diária de leite. AbstractWe studied the lactation of F1 Holstein x Gir, Holstein x Guzerat, Holstein x Azebuado and Holstein x Nellore cows in nine calving orders from two daily milkings. The average daily production, the lactation peak, the day when the peak occurred and the ratio of production in the first and in the second daily milking were analyzed. In the production system, in which the animals were raised, Brachiaria decumbens and Brachiaria brizanta grazing were used as roughage in the rainy season, and corn silage or cane sugar as supplement in the dry season. The concentrate ration was supplied in accordance with the production. It was observed that all of the evaluated traits were directly influenced by the calving order and maternal basis. Amongst the findings, it is outstood that, the average daily milk production of F1 Holstein x Gir and Holstein x Azebuado cows were higher and similar between them while F1 Holstein x Guzerat and Holstein x Nellore cows presented lower productions and they were also similar between them. It is concluded that all of the genotypes groups can be used for the milk production because presenting average daily production higher than 10 kg/cow/day, being compatible with milk production in pasture.

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Efeito da composição genética e de fatores de meio sobre a produção de leite, a duração da lactação e a produção de leite por dia de intervalo de partos de vacas mestiças Holandês-Gir

Cited by 17 publications

References 4 publications

Metabolic and hormone profiles of Holstein x Gyr cows during pre- and postpartum

Metabolic and hormone profiles of Holstein x Gyr cows during pre- and postpartum

A survey of dairy calf management practices in some producing regions in Brazil

Características produtivas da lactação de quatro grupos genéticos F1 Holandês x Zebu

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