Dairy Heifers
Mostrando 1-12 de 43 artigos, teses e dissertações.
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1. Behavior of dairy heifers after increasing the amounts of milk replacer powder added to whole milk
Resumo: O objetivo deste trabalho foi avaliar os efeitos do aumento das concentrações de sólidos totais (ST) no leite, pela adição de quantidades crescentes de sucedâneo do leite em pó, sobre o comportamento de bezerras leiteiras. Bezerras mestiças Holandês-Gir (n = 60) foram distribuídas em quatro tratamentos: 13,5, 16,1, 18,2 e 20,4% de ST. Dos 5
Pesq. agropec. bras.. Publicado em: 02/12/2019
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2. Induction of lactation: an economic study of tool for dairy heifers with successive reproductive failures
RESUMO: O objetivo deste estudo foi avaliar a viabilidade econômica do uso de um protocolo de indução a lactação em novilhas da raça Holandês. Foram coletados dados econômicos do manejo nutricional, reprodutivo e sanitário pré e pós lactação de 30 novilhas induzidas à lactação (IG) e 30 novilhas prenhes (CG). Todos os animais foram inseminado
Cienc. Rural. Publicado em: 25/11/2019
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3. Spatial distribution of dairy heifers’ dung in silvopastoral systems
RESUMO: Os ruminantes variam a trajetória de sua caminhada de acordo com o posicionamento das árvores em sistemas integrados. A deposição de fezes pode estar mais ou menos concentrada em determinados locais, de acordo com a disposição desses condicionadores de pastejo que definem o caminhamento animal. O objetivo deste experimento foi mapear a localiz
Cienc. Rural. Publicado em: 05/09/2019
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4. Cocoa byproduct in diets for dairy heifers
ABSTRACT This study was conducted to evaluate the effect of substituting Tifton 85 hay (Cynodon sp. cv. Tifton 85) with levels of cocoa (Theobroma cacao) byproduct (0, 8, 16, and 24%, diet dry matter basis) in the diet of 16 Holstein × Gir heifers with an average body weight of 363.0±27.7 kg on their nutrient intake, digestibility, and protein balance. The
R. Bras. Zootec.. Publicado em: 29/11/2018
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5. Sugarcane bagasse as exclusive roughage for dairy heifers
ABSTRACT The objective of this study was to evaluate the effect of different concentrate levels (40, 50, 60, and 70% on dry matter basis) on intake, digestibility of nutrients, and performance of heifers fed sugarcane bagasse as exclusive roughage. Twenty Girolando heifers, with an average body weight of 198±25.6 kg were assigned to a completely randomized
R. Bras. Zootec.. Publicado em: 2017-01
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6. Nutrient digestion, microbial protein synthesis, and blood metabolites of Jersey heifers fed chitosan and whole raw soybeans
ABSTRACT This study was undertaken to determine the effects of chitosan and whole raw soybean on nutrient intake and total tract digestion, nitrogen utilization, microbial protein synthesis, blood metabolites, and energy balance of dairy heifers. Twelve Jersey heifers (6±0.5 months of age and 139.50±25.56 kg of live weight; mean ± standard deviation) were
R. Bras. Zootec.. Publicado em: 2016-03
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7. Different true-protein sources do not modify the metabolism of crossbred Bos taurus × Bos indicus growing heifers
The present study was conducted to investigate the effect of alternative true-protein sources to soybean meal, with different ruminal degradability, using a sugarcane-based diet, on nutrient digestion, ruminal fermentation, efficiency of microbial protein synthesis and passage rate in prepubertal dairy heifers. Eight crossbred rumen- and duodenum-cannulated
R. Bras. Zootec.. Publicado em: 2015-02
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8. Effects of supplementation of calcium salts of polyunsaturated fatty acids on serum concentrations of progesterone and insulin of pregnant dairy cows
Forty-five non-lactating, pregnant Holstein animals (18 heifers and 27 multiparous cows; BW = 561±114 kg; BCS = 2.9±0.3; days pregnant = 110±56 d) were stratified by initial BW and BCS, and randomly assigned to receive daily (as-fed basis) 0.50 kg of ground corn plus 0.22 kg of kaolin (CON), calcium salts of saturated fatty acids (SFA) or polyunsaturated
R. Bras. Zootec.. Publicado em: 2014-01
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9. Effects of BST and high energy diet on gene expression in mammary parenchyma of dairy heifers
The objective of this study was to determine the effects of dietary energy and recombinant bovine somatotropin (bST) injection to identify genes that might control mammogenesis. Total RNA was extracted from the parenchymal tissue of 32 heifers randomly assigned to one of four treatments: two diets (a standard diet and a high energy, high protein diet), each
R. Bras. Zootec.. Publicado em: 2013-07
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10. Validação do nanolipe como indicador para estimativa do consumo em bovinos leiteiros
Five crossbred heifers were used in order to validate the NANOLIPE as a marker to estimate dry matter intake in dairy cattle. The results obtained with this marker were compared with three other methods: total collection, fecal crude protein and Klason Lignin (in combination with NANOLIPE). There was no difference between the methods tested (P>5%), a fact th
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/02/2012
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11. Aerobic fungi in the rumen fluid from dairy cattle fed different sources of forage
The objective of this study was to evaluate the aerobic microbiota of the rumen fluid from Holstein cows and heifers fed different tropical forage in the north of Minas Gerais, Brazil. A total of 30 samples of rumen fluid from cows fed with sorghum silage were collected: 32 from cows fed Brachiaria brizantha, 12 from heifers that received sorghum silage and
R. Bras. Zootec.. Publicado em: 2012-11
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12. Type of corn and grinding degree in a concentrate supplied to suckling calves
The objective was to assess the effects of a concentrate consisting of two types of corn: flint and dent, with three different grinding degrees (1, 3 and 5 mm), as a function of intake, performance and digestibility of three crossbred dairy suckling heifers. A randomized block design involving 54 crossbred heifers in a 2 × 3 factorial arrangement was used t
Revista Brasileira de Zootecnia. Publicado em: 2012-06