University Federai Of Vicosa
University Federai Of Vicosa
Luegas J.A.P.,University Federai Of Vicosa |
Tavernari F.C.,Pesquisador na Embrapa suinos e aves |
Barros V.R.S.M.,University Federai Of Vicosa |
Pessoa G.B.S.,University Federai Of Vicosa |
Rostagno H.S.,University Federai Of Vicosa
Archivos de Zootecnia | Year: 2015
The experiment was conducted at Department of Animal Science, Federal University of Viçosa to evaluate the effect of adding probiotics on ileal digestibility in diets for broilers. Four hundred male chicks Cobb 500, between 21-31d of age, were distributed in a randomized complete block design with 10 treatments in a factorial 5 × 2 (No probiotic, with antibiotic and with different strains and concentrations of Bacillus subtilis; and two levels of metabolizable energy: Normal and-100 kcal), with 8 replicates of 5 birds each. In the first three weeks of life, with the goal of increasing the health challenge of the birds received twice a week, a solution of reused litter and water in the ratio of 25 g/l for 8 hours. The addition of growth promoters resulted in increased ileal digestibility of dry matter averaged 6.79 % (67.56 % vs 63.26 %) and increased digestibility of crude protein in 3.64 % (79.45 % vs 76.66 %) on diet without the additive. The addition of probiotics based on Bacillus subtilis or antibiotic acitracin methylene or dissalicilato in the diets of broilers in terms of health challenge is efficient to improve the digestibility of dry matter and crude protein. © 2015, Universidad de Cordoba. All rights reserved.
Marini M.A.,University of Brasilia |
Borges F.J.A.,University of Brasilia |
Lopes L.E.,University of Brasilia |
Lopes L.E.,University Federai Of Vicosa |
And 19 more authors.
Ornitologia Neotropical | Year: 2012
We report the nesting biology of birds in the Cerrado (savanna, both natural and anthropic) of the Federal District of central Brazil, with emphasis on nests, eggs, nesting periods, brood patches, reproductive behavior and period of nesting activity. With 196 nests of 42 species found from 2002 through 2009, we found that most species nested from September to November/December, at the onset of the rainy season, with extensive overlap among species. Contrary to expected for a tropical region, the breeding season period of most species was brief, and lasted 3-4 months. As expected for a tropical region, most species laid two eggs, but clutch sizes reached a maximum of six eggs in a few species. The strong seasonality of the Cerrado, with a rainy season of 7-8 months, is apparently the most important factor that limits breeding and other activities (ex. molt) in this region. Few studies like this are available for the Neotropical region, yet they are fundamental and are still needed and useful for the development of life history theory. Therefore, we recommend that breeding biology receives much more emphasis in future research than to date.