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Supplementation levels for suckling female calves under grazing: productive and...
Ortega, Román Maza; Paulino, Mário Fonseca; Detmann, Edenio; Rennó, Luciana Navajas; Moreno, Deilen Sotelo; Marquez, David ContrerasThe objective in this study was to evaluate the effects of supplementation levels on productive and nutritional performance and metabolic profile in suckling female calves under grazing. Forty female calves (averaging 3.5±0.06 months and 127.3±2.68 kg), and their respective dams were distributed in a completely randomized design with two treatments and twenty replicates. The treatments were 1) 4 g kg-1 body wei...
Ruminal parameters and fatty acid composition of omasal digesta and milk in cow...
Lopes, Fernando César Ferraz; Souza, Shirley Motta de; Valadares Filho, Sebastião de Campos; Gama, Marco Antônio Sundfeld da; Rennó, Luciana NavajasThis study evaluates the intake and digestion of nutrients, parameters of rumen fermentation and degradation, omasal digesta and milk fatty acid composition, productive performance, and the concentration of serum metabolites in cows fed 600 g kg-1 sugarcane-based diets containing 0 (control), 15, 30, and 45 g kg-1 sunflower oil (SO) on a dry matter (DM) basis. Four rumen-cannulated Holstein x Gyr cows yielding ...
Supplementation strategies for Nellore female calves in creep feeding to improv...
Almeida, Daniel Mageste de; Marcondes, Marcos Inácio; Rennó, Luciana Navajas; Martins, Leandro Soares; Marquez, David Esteban ContrerasThe objective of this study was to evaluate the effects of supplementation strategy on performance, nutritional and metabolic characteristics of Nellore suckling female calves, on grazing Urochloa decumbens during the rainy-dry transition period. Forty-four Nellore female calves, averaging 147.6 ± 1.34 kg (4 months), were used. A single supplement 20% of crude protein of dry matter was provided, consisting of d...
Nutritional planning for Nellore heifers post-weaning to conception at 15 month...
Almeida, Daniel Mageste de; Marcondes, Marcos Inácio; Rennó, Luciana Navajas; Silva, Luiz Henrique Pereira; Martins, Leandro SoaresThe objective of this study was to evaluate the effects of strategic supplementation in the dry period and dry/rainy transition period on the performance and nutritional, metabolic, and reproductive responses of Nellore heifers grazing Urochloa decumbens. Forty-eight Nellore heifers with age and body weight (BW) of eight months and 235 ± 3.3 kg, respectively, were used. The experimental design was a completely ...
Tamanho relativo dos órgãos internos e do trato gastrintestinal de bovinos Zebu...
Paulino, Mário Fonseca; Valadares Filho, Sebastião de Campos; Lana, Rogério de Paula; Rennó, Luciana Navajas; Alves, Dorismar DavidUtilizaram-se 12 bovinos machos castrados, com peso vivo médio de 257kg, sendo quatro zebu e oito mestiços leiteiros (quatro ½ sangue Holandês x Gir e quatro ½ sangue Holandês x Guzerá). Foram pesados e distribuídos em dois tratamentos (zebu e mestiços leiteiros), em fase de recria. Os animais foram avaliados até atingirem 340kg de peso vivo. O volumoso utilizado foi o feno de capim Tifton 85 (Cynodon dactylon)...
Protected fat and variable level of protein in diets of crossbreed cows in earl...
Souza Júnior, Alcy Heleno de; Lana, Rogério de Paula; Teixeira, César Roberto Viana; Gionbelli, Mateus Pies; Veloso, Cristina MattosO objetivo desse estudo foi avaliar a inclusão de gordura protegida e de diferentes níveis de PB, na dieta para vacas mestiças, no início da lactação. Foram utilizadas 12 vacas, distribuídas em quadrados latinos 4 x 4 e quatro tratamentos (12 ou 16% de PB, com ou sem MEGALAC-E ® ). Análises estatísticas foram realizadas utilizando Anova e correlações lineares de Pearson. A gordura protegida não influenciou o co...
Nitrogen compounds balance and microbial protein synthesis in supplemented cros...
Gutierrez, Gabriela Santistevan; Lana, Rogério de Paula; Teixeira, Cesar Roberto Viana; Rennó, Luciana Navajas; Veloso, Cristina MattosO objetivo deste trabalho foi avaliar a suplementação de vacas em pastagens de Brachiaria decumbens durante a transição águas-seca. Foram utilizadas oito vacas 1/2 Holandês/Zebu (497 ± 50 kg), distribuídas em dois quadrados latinos 4 x 4, sendo os tratamentos em fatorial 2 x 2 (100% de sal mineral versus sal nitrogenado contendo 25:25:50% de ureia:fubá e sal mineral; e 1,5 versus 3,0 kg d-1 de concentrado por v...
Estimation of daily milk yield of Nellore cows grazing tropical pastures
Marcondes, Marcos Inácio; Rennó, Luciana Navajas; Barros, Lívia Vieira de; Cabral, Carla Heloísa Avelino; Martins, Leandro SoaresBeef cows’ milk yield is typically determined by measuring milk yield once daily and then doubling this value to estimate daily production. However, it is not known whether this is accurate. Thus, we aimed to determine the association between morning and afternoon milk yield in grazing Nellore cows. Eighty Nellore cows were used, with initial weight of 516.0 ± 1.0 kg. The experiment was a completely randomized ...
Soybean grain is a suitable replacement with soybean meal in multiple supplemen...
Almeida, Daniel Mageste de; Marcondes, Marcos Inácio; Rennó, Luciana Navajas; Martins, Leandro Soares; Villadiego, Faider Alberto CastañoThe research aimed to evaluate the effect of replacing soybean meal with soybean grain on the nutritional parameters and productivity of heifers grazing on Urochloa decumbens in the rainy-dry transition period. Forty crossbred heifers with the initial age and weight of 18 months and 292 ± 6.1 kg, respectively, were used. The experimental design was a completely randomized design, with five treatments and eight ...
Milk fatty acid composition of Holstein x Gyr dairy cows fed sugarcane-based di...
Souza, Shirley Motta de; Lopes, Fernando César Ferraz; Valadares Filho, Sebastião de Campos; Gama, Marco Antônio Sundfeld da; Rennó, Luciana NavajasSugarcane is a strategic roughage source for milk production in the tropics, and its supplementation with plant oils offers great potential for obtaining milk enriched with beneficial fatty acids, such as oleic (cis-9 C18:1), vaccenic (trans-11 C18:1), and rumenic (cis-9, trans-11 CLA) acids. The aim of this study was to evaluate the milk fatty acid composition of cows fed 60% chopped sugarcane-based diets cont...