Diallel Analysis of In Situ Dry Matter Degradability of Corn Silage. (C01-vonpinho116025-poster)
Authors:
R.G. Von Pinho* - Federal University of Lavras M.S. Gomez - UFLA, Lavras, MG, Brazil M.A.P. Ramalho - UFLA,Lavras,MG,Brazil
Abstract:
One of the best ways of evaluating the quality of the silage of a corn cultivar is through the digestibility of the whole plant. However, there is little information on its genetic control and breeding alternatives which may be utilized. This work aimed to obtain information on its genetic control with a view in helping future breeding programs. For this purpose, 12 lines previously selected, 6 being of greater and 6 of less digestibility to make up a 6 x 6 partial diallel plus the parental lines were utilized. The seeds of the hybrids and of the respective lines were sown in an experimental area of the Federal University of Lavras-UFLA, in Brazil, at two sowing seasons (November and December). For evaluation of digestibility of the silages, in situ dry matter digestibility (ISDMD) was employed, four fistulated cows being utilized where each animal was given the samples of the plots which were incubated for 24 hours.
Manifested heterosis was of low magnitude, contributing on average with less than 7% to the performance of the crosses evaluated. The predominance of effects additive to the inheritance of the trait em as issue was verified. It became clear that the best breeding strategy with the objective of producing corn cultivars for silage production is by means of the cross of parents with high ISDMD of their silages and with good combining ability for the characters where heterosis shows greater
importance.
Speaker Information: Renzo Von Pinho, Federal University of Lavras, Av. Aldeia Formosa 87, Cond.
Aldeia de Sagres, Lavras, MG 37200-000; Phone: 553528223699; E-mail: [email protected]
Session Information: Monday, November 3, 2003, 4:00 PM-6:00 PM Presentation Start: 4:00 PM (Poster Board Number: 809)
Keywords: Dry Matter; Corn; Silage; Genetic Control
