Influence of cultivar, sowing date and maturity at harvest on yield, digestibility, rumen fermentation kinetics and estimated feeding value of maize silage
- 7 December 2012
- journal article
- research article
- Published by Cambridge University Press (CUP) in The Journal of Agricultural Science
- Vol. 151 (5), 740-753
- https://doi.org/10.1017/s0021859612000925
Abstract
SUMMARY: Two maize hybrid cultivars, early (Cisko FAO 300) and late maturing (Arma FAO 700), were sown on three different dates (March, April or May) and harvested at two stages of maturity (kernel milk line (ML) scores of 1/4 < ML < 1/3 or 1/2 < ML < 2/3) in the western Po plain (Italy) in 2008. Yield, chemical composition andin vitrodigestibility and fermentation kinetics of pre-ensiled whole-crop maize and of silage were measured. Cultivar and sowing date influenced the dry matter (DM) yield of whole-plant maize, with DM yield being 40% higher in Arma than in Cisko, and DM yield decreasing with later sowing dates. Later maturity increased DM concentration at harvest for both hybrids, due to differences in kernel development. The neutral detergent fibre (NDF) content declined and starch increased as plants matured. Digestibility was estimatedin vitrofollowing the Ankom procedure. Rate and extent of ruminal degradation were estimated from gas production (GP) profiles during incubation in diluted rumen fluid. Cultivar, planting date and maturity had no effect onin vitroDM digestibility of pre-ensiled whole-crop maize, but following 240 days of ensiling significant differences between cultivars in digestibility were detected. GP kinetic parameters differed between cultivars for pre-ensiled whole-crop maize, with Cisko having higher asymptotic GP but lower fractional fermentation rates and longer lag times than the Arma hybrid. GP volumes were greater as sowing or harvest dates were delayed. Energy value and milk production were estimated using the Milk2006 Model. With the pre-ensiled whole-crop maize, a 38% greater milk yield/ha was expected with Arma than with Cisko, matching the 40% greater DM yield. The same trend was observed in maize silage, where cultivar and planting date affected milk production/ha, with greater values for Arma than for Cisko and lower values for the latest planting date. Optimal management practices, including decision making on planting and harvest time and hybrid cultivar selection, can influence the yield and nutritive value of maize silage.Keywords
This publication has 37 references indexed in Scilit:
- Genotype and Year Effect on Grain Yield and Nutritive Values of Maize (Zea mays L.)Journal of Animal and Veterinary Advances, 2011
- Effect of nitrogen fertilization on chemical composition and rumen fermentation of different parts of plants of three corn hybridsAnimal Feed Science and Technology, 2011
- Some methodological and analytical considerations regarding application of the gas production techniqueAnimal Feed Science and Technology, 2007
- In vitro and in situ techniques for estimating digestibility.Published by CABI Publishing ,2005
- The relationship betweenin vitrogas production,in vitromicrobial biomass yield and15N incorporation and its implications for the prediction of voluntary feed intake of roughagesBritish Journal of Nutrition, 1997
- Forage Quality and Harvest Index of Corn Hybrids under Different Growing ConditionsAgronomy Journal, 1994
- Microbial fermentation of cereal grains in vitroAustralian Journal of Agricultural Research, 1994
- Changes with maturity in fibre composition and levels of extractable polyphenols in Greek browse: Effects on in vitro gas production and in sacco dry matter degradationJournal of the Science of Food and Agriculture, 1993
- The use of the rumen degradation characteristics of hay as predictors of its voluntary intake by sheepAnimal Science, 1991
- Using the Kernel Milk Line to Visually Monitor Grain Maturity in Maize 1Crop Science, 1984