Efficiency At Weaning
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Genetic parameters, genetic trends, and principal component analysis for productive and reproductive traits of Guzera beef cattle
ABSTRACT The objectives of this study were to estimate genetic parameters and genetic trends and perform principal component analysis for the following traits: body weight adjusted at 210 days of age (W210), one year (W365), and yearling or 450 days of age (W450); weight gain from birth to weaning or 210 days of age (WGBW), from weaning to 365 days of age (W
R. Bras. Zootec.. Publicado em: 12/09/2019
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2. Effect of feeding heat-treated and unheated colostrum on immunoglobulin G absorption, health and performance of neonatal Holstein dairy calves
ABSTRACT. First colostrum is an important source of nutrients and immune factors which are necessary for calves in the first weeks of life. Despite these benefits, colostrum can also represent one of the earliest potential exposures of dairy calves to infectious agents which these patogens can act directly on growth and cause diseases such as scours or septi
Acta Sci., Anim. Sci.. Publicado em: 04/07/2019
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3. Performance of Holstein calves having free access to milk and dosed with Megasphaera elsdenii
ABSTRACT Megasphaera elsdenii converts lactate and glucose into butyrate, the main volatile fatty acid responsible of papillae development and may benefit calf performance. Twenty-six Holstein calves (BW = 34.5 ± 1.65 kg) were randomly assigned at birth to a control group (Meg0) and a group that received an oral dose of M. elsdenii NCIMB 41125 at 14 d of ag
Sci. agric. (Piracicaba, Braz.). Publicado em: 2017-06
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4. Energy utilization of light and heavy weaned piglets subjected to different dietary energy levels
ABSTRACT This study was conducted to evaluate the effects of dietary metabolisable energy (ME: 3.25, 3.40, 3.55, or 3.70 Mcal kg−1) and weaning weight (WW: light 4.0±0.7 kg, and heavy: 6.3±0.6 kg) on productive response and energy utilization of weaned piglets. Sixty-four male piglets were housed in 32 metabolic cages (two animals per cage) during the fi
R. Bras. Zootec.. Publicado em: 2016-09
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5. Concentrate supplementation during pregnancy and lactation of ewes affects the growth rate of lambs from a variety of crosses
The objective of this study was to determine how concentrate supplementation during late third gestation and lactation affects ewe and offspring performance from birth to weaning. Thirty-six ewes and their offspring (n = 32) were used. Eighteen Morada Nova and 18 Santa Inês ewes were artificially inseminated with semen from Dorper ram and distributed in a c
R. Bras. Zootec.. Publicado em: 2014-10
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6. Efficiency of calf production of cows from two genetic groups
The objective was to evaluate the effect of weight, age and production efficiency of cows from genetic groups based on the calf weight at calving and at weaning. For a period of five years, data of 120 cows (60 Angus-Nellore (AN) and 60 Simmental-Nellore (SN)) at four to nine-years of age were evaluated. All cows were maintained on Brachiaria decumbens pastu
R. Bras. Zootec.. Publicado em: 2014-07
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7. Metabolism and ruminal parameters of Holstein × Gir heifers fed sugarcane and increasing levels of crude protein
The objective of this study was to evaluate the effect of increasing levels of crude protein (CP) in the diet (13, 15, 19 and 22 g/100 g of dry matter, DM) on the metabolism and ruminal parameters of crossbred heifers fed forage sugarcane. Four crossbred Holstein × Gir heifers of average initial weight of 200 kg and average age of 14 months were used. The e
R. Bras. Zootec.. Publicado em: 2012-09
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8. Eficiencia de producao de vacas de corte com diferentes potenciais para producao de leite.
Foram utilizadas informacoes de 246 animais, nascidos nos anos de 1990 e 1991, progenies de vacas meios-sangues entre racas europeias e Nelore. O objetivo deste trabalho foi o de avaliar a eficiencia de producao de vacas de corte com diferentes potenciais para producao de leite. Os resultados obtidos permitiram a conclusao de que houve diferencas entre os di
Pesquisa Agropecuaria Brasileira. Publicado em: 2011
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9. Estimativas de componentes de variÃncias e de valores genÃticos para caracterÃsticas de crescimento, reproduÃÃo e habilidade materna em ovinos da raÃa Somalis Brasileira / Estimates of variance components and breeding values for growth, reproductive and maternal traits of Brazilian Somali hair sheep
The aims of this study were to estimate genetic parameters for growth, reproductive and maternal traits and assess the different adjustments of fixed effects in the prediction of breeding values for weight and weight gain at weaning of Brazilian Somali sheep, reared in semi-arid. Data from the NÃcleo de ConservaÃÃo da Embrapa Caprinos e Ovinos, located in
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/12/2010
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10. PRE AND POST WEANING PERFORMANCE EVALUATION FOR A MULTIBREED ABERDEEN ANGUS X NELLORE POPULATION USING DIFFERENT GENETIC MODELS / AVALIAÇÃO DO DESEMPENHO NA PRÉ E PÓS DESMAMA PARA UMA POPULAÇÃO BOVINA MULTIRRACIAL ABERDEEN ANGUS X NELORE UTILIZANDO DIFERENTES MODELOS GENÉTICOS
The objective of this study was to estimate the genetic effects that affect the pre and post weaning performances of animals, products from Aberdeen Angus (A) and Nellore (N) breeds crosses. In Article 1, there were used the weaning weights (PD) to test five genetic models (M). The M1, complete, containing the fix breed genetic effects direct additive (AD) a
Publicado em: 2009
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11. Glutamine, glutamic acid and or yeast extract in the diet of weaned pigs / Glutamina, ácido glutâmico e ou extrato de levedura na dieta de leitoes desmamados
The present study aimed to evaluate the effects of the supplementation of different sources of protein concentrates, glutamine, acid glutamic and or yeast extract in diets of piglets from 26 to 44 days of age. At 22nd day of age, weaning day, 210 piglets, females and castrated males, crossbred of Landrace, Large White and Duroc races, with 6,79 kg average we
Publicado em: 2008
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12. Intake, feed efficiency and nutritional requirements of lactating and fattening beef cows / Consumo, eficiência alimentar e exigências nutricionais de vacas de corte na lactação e terminação
This study estimated the requirements and feed efficiency of non-pregnant lactating beef cows, as well as cow calf pairs. It also correlated the efficiency of the cows and their progeny during lactation to efficiency determined for the same cows in a finishing trial after weaning. In the lactating phase cow calf pairs were evaluated from just after birth (17
Publicado em: 2007