Programa de Pos graduacao em Zootecnia UFV

Brazil

Programa de Pos graduacao em Zootecnia UFV

Brazil
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Gomes Pinto A.P.,Programa de Pos graduacao em Zootecnia UFV | Lopes P.S.,Federal University of Viçosa | Lopes M.S.,Graduacao em Zootecnia UFV | Silva Filho M.I.,Programa de Pos graduacao em Genetica e Melhoramento UFV | And 3 more authors.
Revista Brasileira de Zootecnia | Year: 2010

The objective of this study was to map quantitative trait loci (QTL) in chromosomes 9, 10 and 11 of swines (Sus scrofa) and to associate their effects on traits of carcass, carcass cuts, organs and guts, performance and meat quality. Samples of DNA of animals from a F2 population originated from crosses between Piau breed males and Landrace × Large White × Pietrain females were used. A total of 13 microsatellite loci were used to build link maps of the present population. Analyses of association were done using mapping of intervals by regression for QTL detection. Significant association were identified at the cromossomic level between cromossome 9 regions and total (bone-in) loin weight and boneless loin weight. On cromossom 10, three significant QTL were detected for midline backfat thickness immediately between the last and penultimate the last rib, lung weight and redness and a significant QTL at the genomic level for weight of liver. On chromosome 11, only one significant association was detected at cromosomic level related for backfat thickness immediately after the last rib at 6.5 cm from the midline. Information from significant QTL found here are important for future studies as fine mapping and gene identification, which help on a better understanding of physiology and characteristics of swine production. © 2010 Sociedade Brasileira de Zootecnia.


Henrique D.S.,Programa de Pos graduacao em Zootecnia UFV | Henrique D.S.,Federal Technological University of Paraná | de Paula Lana R.,Federal University of Viçosa | Vieira R.A.M.,State University of Norte Fluminense | And 2 more authors.
Revista Brasileira de Zootecnia | Year: 2011

A mathematical model based on Cornell Net Carbohydrate and Protein System (CNCPS) was developed and adapted in order to evaluate beef cattle rations at tropical climate conditions. The presented system differs from CNCPS in the modeling of insoluble particles' digestion and passage kinetics, which enabled the estimation of fiber mass in rumen and its effects on animal performance. The equations used to estimate metabolizable protein and net energy requirements for gain, net energy requirement for maintenance and total efficiency of metabolizable energy utilization were obtained from scientific articles published in Brazil. The parameters of the regression equations in these papers were estimated using data from Bos indicus purebred and crossbred animals reared under tropical conditions. The model was evaluated by using a 368-piece of information database originally published on 11 Doctoral theses, 14 Master's dissertations and four scientific articles. Outputs of the model can be considered adequate. © 2011 Sociedade Brasileira de Zootecnia.


Zervoudakis J.T.,Programa de Pos graduacao em Zootecnia UFV | Paulino M.F.,Federal University of Viçosa | Cabral L.S.,Federal University of Mato Grosso | Detmann E.,Federal University of Viçosa | And 2 more authors.
Revista Brasileira de Zootecnia | Year: 2010

The aim of this study was to evaluate the use of self-control supplements on nutritional parameters of steers grazing Brachiaria decumbens Stapf. during the rainy-dry season transitional period. Four crossbred steers fistulated in rumen, abomasum and esophagus were used. Mineral salt (SAL) and supplements based on: mineral mix, salt, and ground corn grain (GCG); mineral mix, urea and ground corn grain (UGCG); and mineral mix, urea, grounded corn grain and soybean meal (UGCSM), with different protein contents were given. The supplements did not promote significant differences for intake of nutrients except for crude protein intake whose greater values were obtained with the use of supplements of ground corn grain and soybean meal. There was no effects of the supplements on transit kinetic parameters of the particles; the mean values found for rate of passage and mean retention time in the rumen and gastrointestinal tract were 0.018 h-1 and 106.93 hours, respectively. Supplementation changed ruminal ammonia concentration whose greatest values were obtained with the supplement containing soybean meal (31.25 mg/dL) and ground corn grain (24.22 mg/dL). There was no effect of supplementation on apparent total, ruminal and intestinal digestibility of dry matter, organic matter, total carbohydrates, neutral detergent fiber and neutral detergent fiber but it affected crude protein apparent digestibility which was the highest in the animals fed supplement with soybean meal. Supplements with mineral mixture, urea, ground corn grain and soybean meal promote the highest N-urea excretions and it shows more microbial efficiency. © 2010 Sociedade Brasileira de Zootecnia.


do Nascimento Rangel A.H.,Programa de Pos graduacao em Zootecnia UFV | de Souza Campos J.M.,Brazilian National Council for Scientific and Technological Development | de Oliveira A.S.,Programa de Pos graduacao em Zootecnia UFV | Valadares Filho S.C.,Brazilian National Council for Scientific and Technological Development | And 2 more authors.
Revista Brasileira de Zootecnia | Year: 2010

This study evaluated the response of dairy heifers fed corn based silage with 1.3 kg/day of concentrated in comparison with three sugar cane-based diets corrected with 1% of urea + ammonium sulphate (9:1) (urea), with 1.3; 2.0 and 2.7 kg/day of concentrate. A total of 20 heifers were used (12 Holstein breed and 8 Brown Swiss breed heifers) in a randomised block design, with 5 blocks formed on the basis of initial live weight and breed. The consumption of dry matter, organic matter and neutral detergent fiber did not differ between corn-silage based diet and sugar-cane based diet. Higher consumption of ether extract was found when diet based on corn silage was supplied in comparison to those based on sugar cane. Intakes of total carbohydrate and non-fibrous carbohydrates differed between corn silage diet and those based on sugarcane (1.3 and 2.0 kg concentrate). Total digestible nutrient intake observed with supply of the diet based on corn silage was lower than that obtained with sugar cane (2 kg concentrate). Diets had a significant effect on coefficients of digestibility of crude protein, ether extract, total carbohidrates and neutral detergent fiber. There was no significant difference on total weight gain neither on average daily gain between the corn-silage based diet and the sugar-cane diet with 2.7 kg of concentrate in relation to the sugar-cane diets. Ruminal pH did not differ at collection times among experimental diets. The lowest concentration of N-NH3 was observed in animals fed corn silage-based diet 3 hours after feeding compared to the sugar cane-based treatments. A milk production system with heifers calving at 24 months and fed a diet containing moderate to high concentrate levels (± 45:55, forage:concentrate), sugar cane forage added with 1% of a mixture of urea + ammonium sulfate (9:1, urea:ammonium sulphate) can be a substitute for corn silage. © 2010 Sociedade Brasileira de Zootecnia.

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