Menezes G.C.D.C.,Federal University of Viçosa |
Valadares Filho S.D.C.,Federal University of Viçosa |
Ruas J.R.M.,Agricultural Research Company of Minas Gerais EPAMIG |
Detmann E.,Federal University of Viçosa |
And 5 more authors.
Scientific World Journal | Year: 2014
The aim of this study was to evaluate the productive and biological efficiency of steers and heifers from dairy genetics in a feedlot system in terms of meat production. Twenty-four steers and 24 heifers at 10 monthes of age, (3/4) Zebu × (1/4) Holstein were utilized. They were distributed over four feedlot times, 30, 60, 90, and 120 days with four replications for each sex, and were slaughtered at the end of each period. The productive and biological analyses were performed through comparative slaughter to determine the body composition. Heifers presented with greater intakes (P<0.05) of dry matter in grams per kg of body weight. Steers presented with a greater (P<0.05) final empty body weight, carcass gain, cold carcass weight, and meat proportion in the carcass; however, heifers presented with a greater subcutaneous fat thickness (P<0.05) and, consequently, a greater (P<0.05) fat proportion in the carcass. We conclude that steers are more efficient in their productive performance than heifers in a feedlot. For the finishing carcass fat cover, heifers need 90 days in the feedlot. The net energy requirements for maintenance are 67 kcal/EBW0.75/d, and the net requirements of energy (NEg) and protein (NPg) for gain can be estimated by the following equations: NEg(Mcal/d)=0.067×EBW0.75× EBG1.095 and NPg=162×EBG-5.62×RE for the two sexes. © 2014 Gustavo Chamon de Castro Menezes et al.
de Menezes G.C.C.,Federal University of Viçosa |
Valadares Filho S.,Federal University of Viçosa |
Lopez-Villalobos N.,Massey University |
Ruas J.R.M.,Agricultural Research Company of Minas Gerais Epamig |
And 6 more authors.
Tropical Animal Health and Production | Year: 2015
The objective of this study was to evaluate the effect of five feeding strategies on calf weaning weight, and cow milk production and composition in Brazilian Holstein × Zebu cows. A total of 60 cows and their calves were allocated to each of five treatments. Cows in treatments 1, 2 and 3 were milked for 270 days and cows in treatments 4 and 5 were milked for 180 days. Calves in treatment 1 (CON) were not supplemented with concentrate whereas calves from treatment 2 (CLPN) received 1 kg of concentrate daily from 90 to 270 days of age and calves from treatment 3 received 1 kg of concentrated from 180 to 270 days of age. Calves in treatment 4 (CCPS) were supplemented with 1 kg of concentrate from 90 to 180 days of age and calves in treatment 5 (CLPS) were supplemented with 1 kg of concentrate from 90 to 270 days of age. Calves from the CLPS treatment had greater milk and protein intakes (P < 0.05) and greater growth rate than calves from the other treatments. Our results indicate that the traditional system of feeding calves with no concentrate results in a weight gain of 600 g/day. The CLPS treatment produced calves with the highest live weight and growth rate. The nutritional strategy with restricted supply of milk for the calves with concomitantly short-term concentrate supplementation does not improve performance of calves but did increase feed costs. © 2015, Springer Science+Business Media Dordrecht.
Ribeiro R.C.,Federal University of Minas Gerais |
Pinheiro-Sant'ana H.M.,Federal University of Viçosa |
de Padua J.G.,Agricultural Research Corporation of Minas Gerais EPAMIG |
Chaves J.B.P.,Federal University of Viçosa
Bioscience Journal | Year: 2016
The present work aimed to analyze the factors that affect the purchase of potatoes in Belo Horizonte city, Brazil, and the effects of the availability of many different French cultivars to this market. In France, there is a large variety of potatoes with different shapes, skin colors and textures and indications for different culinary uses. Therefore, cluster analysis was performed and a mixed effects linear regression model was adjusted to analyze the factors that can influence the purchase of potatoes by consumers. The factors analyzed were the size, skin color and texture and the presence of information about the cultivar name, culinary use and seal of quality. Age, education, region and income were important parameters in determining a groups’ intent to purchase, and factors such as potato shape, skin color and presence of a seal of quality were significantly important in the analysis. The presence of information related to the name of the cultivar and recommended culinary use had no significant effect on purchase intention. Last, the introduction of new French potato cultivars into such markets as Belo Horizonte city should be preceded by an educational process to prepare consumers to receive information regarding the recommended culinary use of potatoes and the final sensory quality of the preparations illustrated with these potatoes. © 2016, Universidade Federal de Uberlandia. All rights reserved.
Santos S.A.,Federal University of Viçosa |
de Valadares Filho S.C.,Federal University of Viçosa |
Detmann E.,Federal University of Viçosa |
Valadares R.F.D.,Federal University of Viçosa |
And 3 more authors.
Tropical Animal Health and Production | Year: 2012
The objective of this study was to evaluate the nutrient intake and milk production in Holstein × zebu (F1) cows in feedlot. Eighteen F1 cows were used, divided into three treatments; six were Holstein × Gir (HGI), six were Holstein × Guzerat (HGU), and another six were Holstein × Nelore (HNE), which had recently calved, distributed into simple, random samples, under the same feeding conditions of corn silage and concentrate with 20% crude protein. The three-marker method was used (LIPE®, titanium dioxide, and iADF) to estimate the individual intake and digestibility of the nutrients for the cows in group. The mathematical model used to establish the lactation curves was: Y = at be -ct by Wood (Nature 216:164-165, 1967). The statistical analyses for the nutrient intake and digestibility, as well as parameters of metabolic efficiency, were performed using multiple linear regression (α = 5%). No effect (P > 0.05) of genetic group was observed for any of the variables studied. The intake and digestibility of the nutrients and the microbial nitrogen presented quadratic curves as a function of the lactation period (P < 0.05). The HGU cows exhibited an accumulated milk production of 4,946. 81 kg at 305 days, whereas the HGI cows produced 4,821.78 kg. The HNE cows displayed inferior performance, with a production of 3,674.98 kg. It was concluded that, in confinement, F1 cows from different genetic groups do not exhibit different intake, digestibility, or metabolic efficiency. The HGU and HGI cows have greater cumulative production at 305 days. © 2012 Springer Science+Business Media B.V.
Moreira R.A.,Federal University of Minas Gerais |
Fernandes D.R.,Federal University of Minas Gerais |
da Cruz M.D.C.M.,Federal University of Minas Gerais |
Lima J.E.,Federal University of Minas Gerais |
de Oliveira A.F.,Agricultural Research Company of Minas Gerais EPAMIG
Scientia Horticulturae | Year: 2016
Information about reproductive behavior of the olive trees (Olea europaea L.) in regions with lower occurrence of cold is fundamental to the expansion of its economic cultivation. Researches studding the adequacy of management techniques in order to promote flowering in these regions are important. Thus, this research was conducted to evaluated water restriction, girdling and paclobutrazol on flowering and production of olive cultivars. Three experiments were conducted in Federal University of the Jequitinhonha and Mucuri Valleys in Diamantina, Minas Gerais, Brazil. In the first experiment, 'Arbequina' olive trees were subjected to water restriction and two environmental conditions. In the second experiment, the girdled branches in different times on flowering and nutritional behavior of 'Grappolo 541' and 'Barnea' olive trees were evaluated. And in the third experiment, the application of paclobutrazol (PBZ) and the water restriction were studied in the vegetative growth and flowering of 'Ascolana' olive trees. The flowering of 'Arbequina' olive tree occurred with the averages of minimum temperatures varied from 8.4 to 11.7. °C, in autumn and winter. The girdling at different times did not influence the production of olive trees 'Barnea' and 'Grappolo 541'. The girdled branches had a higher nutrient levels in leaves.The application of paclobutrazol in the soil promoted the reduction in vegetative growth of 'Ascolana' olive trees, with increase of flowering and fruiting. The water restriction did not favor the flowering of 'Arbequina' and 'Ascolana' olive trees and it reduced the effect of PBZ in 'Ascolana'. © 2016 Elsevier B.V.