Variation and covariation of silage maize digestibility estimated from digestion trials with sheep |
| |
| Authors: | Y Barrière R Traineau J C Emile Y Hébert |
| |
| Institution: | (1) Station d'Amélioration des plantes fourragères, INRA, 86600 Lusignan, France |
| |
| Abstract: | Summary Variation and covariation for agronomic and digestibility traits of silage maize are reported from a compilation of 22 years of experiments with standard sheep. Genotype effects of DOM and DCF were highly significant, even when genotypes were nested in earliness groups or brown-midrib hybrids discarded (Table 2). The genetic variance of crude fiber content was low, but the variance of the DCF was high. The genetic variance of DOM was about 4 times lower than genetic variance of DCF, but broad sense heritability of DOM was higher because of lower residual variance (Table 3). Genetic correlations between grain or crude fiber content and DOM had similar absolute values, 0.65, so each of these two traits was an important but not the unique determinant of silage maize quality. There was no correlation between DCF and grain or crude fiber content. Yield was not related to DOM or DCF within each group of earliness, allowing some quality improvement without agronomic drift (Table 4). Except for late hybrids, most of DOM differences between groups of earliness came from lowering of minimum value, while maximum values were similar. It was the contrary for DCF, with similar minimum values for all groups (Table 5). There was no obvious correlation between year of registration of hybrids and DOM or DCF, but extra new variation seemed obtained only for low values (Figs 1, 2; Table 6). IVDOM according to the APC process was a poor predictor of DOM, especially when brown-midrib hybrids and earliness effects were discarded; but because heritability of this trait was similar to DOM heritability, such enzymatic processes could probably be used to avoid drift towards poor DOM with hybrids bred for higher stalk strength.Abbreviations APC
Amylase Pepsine Cellulase solubility
- DDM
sheep digestibility of dry matter
- DOM
sheep digestibility of organic matter
- DCF
sheep digestibility of crude fiber
- DM
dry matter
- IVDCW
in vitro digestibility of cell wall
- IVDDM
in vitro digestibility of dry matter
- IVDOM
in vitro digestibility of organic matter
- NIRS
near infra-red reflectance spectroscopy
- NDF
neutral detergent fiber
- bm1-brown-midrib-1 allele, bm3-brown
midrib-3 allele |
| |
| Keywords: | Breeding heritability in vitro digestibility in vivo digestibility maize silage maize variation Zea mays |
| 本文献已被 SpringerLink 等数据库收录！ |
|
