Crossbred Dairy Cows
Mostrando 1-12 de 27 artigos, teses e dissertações.
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1. Performance and metabolite profile of dairy cows fed tropical grasses and concentrates containing crude protein with low or high degradability
ABSTRACT Ten Holstein-Zebu crossbred cows distributed into two simultaneous Latin squares (5 × 5) as a 2 × 2 factorial arrangement formed by chopped sugarcane or elephant grass silage, both with high or low protein degradability supplements and a corn silage as a control treatment, were compared using orthogonal contrasts. The studied variables were the pe
R. Bras. Zootec.. Publicado em: 2016-09
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2. Intake, apparent digestibility, production, and composition of milk from cows fed diets with different sources of lipids
ABSTRACT The objective of this study was to evaluate the effect of different sources of lipids in the diets of dairy cows on the intake and digestibility of nutritional fractions, and milk production and composition. The experiment was conducted in a 42-hectare area divided into eight paddocks covered with Brachiaria brizantha. Twelve crossbred Holstein × Z
R. Bras. Zootec.. Publicado em: 2016-02
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3. Performance and rumen parameters of crossbred dairy cows fed two sugarcane varieties combined or not with soybean hulls
Two sugarcane varieties (IAC86-2480 and IAC91-2195) combined or not with soybean hulls (SH), partially replacing corn in concentrate, were included in the diet of crossbred dairy cows to evaluate the effects on feed intake, milk production, milk composition and rumen parameters of crossbred cows. The sugarcane varieties (IAC86-2480 and IAC91-2195) and concen
R. Bras. Zootec.. Publicado em: 2014-12
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4. Nutritive value of Tanzania grass for dairy cows under rotational grazing
A nutritional analysis of Tanzania grass (Megathyrsus maximus Jacquin cv. Tanzânia was conducted. Pasture was managed in a rotational grazing system with a 30-day resting period, three days of paddock occupation and two grazing cycles. Ten Holstein × Zebu crossbred cows were kept within a 2-ha area divided into 11 paddocks ha-1. Cows were fed 2 kg of corn
R. Bras. Zootec.. Publicado em: 2014-08
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5. Spatial distribution of feces and estimates of nitrogen return by dairy cows on mombasa grass pastures
The objective of this study was to identify the pattern of deposition of feces by supplemented crossbred dairy cows after the lactation peak on cultivated areas under levels of intensification of the system and its effects on nitrogen cycling, with the aid of geostatistics, in the rainy period. Treatments were composed of two levels of nitrogen fertilization
R. Bras. Zootec.. Publicado em: 2013-05
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6. Productive performance and efficiency of utilization of the diet components in dairy cows fed castor meal treated with calcium oxide
The effect of replacing of 0; 0.33; 0.67 and 1.0 (kg/kg) of soybean meal (SBM) by undecorticated castor seed meal treated with calcium oxide (CMT - 60 g/kg) was evaluated on performance and efficiency of nutrient utilization in dairy cows. Sixteen Holstein and crossbred cows were distributed in four 4 × 4 latin squares. Animals received concentrated feed at
R. Bras. Zootec.. Publicado em: 2012-10
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7. Protein sources for crossbred dairy cows in the semiarid
Alternative sources of protein for lactating cows were evaluated in this study with respect to intake, digestibility, milk yield and milk composition. Eight multiparous Holstein/Gyr cows were simultaneously distributed in two 4 × 4 latin squares. Each experimental period lasted 21 days (14 days for adaptation and seven days to collect data and samples). Thr
R. Bras. Zootec.. Publicado em: 2012-10
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8. Sources of variation in milk urea nitrogen in Paraná dairy cows
The present study was conducted to determine the relationship between milk urea nitrogen (MUN) and milk yield, fat and protein contents, breed and season effects, parity and days in milk in dairy cows from Paraná State, Brazil. A total of 127,428 test-days from 16,013 dairy cows belonging to 96 herds enrolled in an official milk recording program were analy
Revista Brasileira de Zootecnia. Publicado em: 2012-03
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9. Interações entre variáveis bioquímicas sanguíneas no período de transição e indicadores de eficiência reprodutiva em vacas leiteiras criadas a pasto / Interactions between blood biochemical variables in transition period and indicators of reproductive efficiency in dairy cows created a pasture
Esse trabalho foi desenvolvido com o objetivo de avaliar as alterações de algumas variáveis bioquimicas sanguineas no período de transição como indicativas de doenças metabolicas e correlaciona-las com os intervalos parto primeiro estro, parto concepção, taxa de concepção por serviço e paridade em vacas leiteiras mestiças criadas a pasto. Foram
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 13/11/2011
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10. Intake and lactation curves of F1 Holstein x Zebu dairy cows in pasture and feedlot / Curvas de lactação e consumo de vacas F1 Holandês x Zebu em pastejo e em confinamento
O presente trabalho foi constituído de três experimentos, que foram descritos em quatro capítulos. Para o capítulo 1 foi objetivo avaliar o efeito de diferentes volumosos sobre o desempenho de vacas em lactação F1 Holandês x Gir em condições tropicais. O experimento foi conduzido na Fazenda Experimental da Empresa de Pesquisa Agropecuária de Minas
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/02/2011
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11. Evaluation of intervals between observations on estimation of eating behavior of cattle
The effect of different intervals between observations on the estimation of the eating behavior of dairy heifers and lactating cows was evaluated. Twenty Holstein-zebu crossbred dairy heifers were distributed in a completely randomized design, with four levels and five repetitions, fed isonitrogenous diets containing 71% sugar cane and 29% concentrate. Also,
Revista Brasileira de Zootecnia. Publicado em: 2011-11
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12. Efeito de dois níveis de concentrado no período inicial da lactação sobre a produção de leite e eficiência reprodutiva.
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Pesquisa Agropecuária Brasileira. Publicado em: 2011