Stay-green ranking and maturity of corn hybrids: 1. Effects on dry matter yield, nutritional value, fermentation characteristics, and aerobic stability of silage hybrids in Florida
- 1 February 2012
- journal article
- Published by American Dairy Science Association in Journal of Dairy Science
- Vol. 95 (2), 964-974
- https://doi.org/10.3168/jds.2011-4524
Abstract
This study determined effects of maturity, stay-green (SG) ranking, and hybrid source on dry matter (DM) yield, nutritive value, fermentation, and aerobic stability of corn hybrids. One high stay-green (HSG) hybrid and one average stay-green (ASG) hybrid with similar relative maturity (117 d) from each of 2 seed companies (Croplan Genetics, St. Paul, MN; Pioneer Hi-Bred International, Des Moines, IA) were grown on 1-× 6-m plots at random locations within each of 4 blocks. The hybrids were harvested at 25, 32, and 37% DM from each plot and separated into thirds for botanical fractionation and analysis, whole-plant chemical analysis, and ensiling. Chopped, whole plants were ensiled (8 kg) in quadruplicate in 20-L mini-silos for 107 d. A split-plot design was used for the study. Yields of whole-plant and digestible DM and concentrations of starch and DM increased with maturity, whereas concentrations of crude protein, water-soluble carbohydrates, and neutral detergent fiber decreased. High SG hybrids had greater DM yield than ASG hybrids when harvested at 25 and 37%, but not 32% DM. Unlike those from Croplan Genetics, the Pioneer HSG hybrid had greater ear and whole-plant DM concentration than their ASG hybrids. Stover moisture and CP concentration were greater among HSG versus ASG hybrids, particularly among Croplan Genetics hybrids. Croplan Genetics HSG hybrids had greater neutral and acid detergent fiber concentrations and lower in vitro DM digestibility in the unensiled whole-plant, the stover, and the silage than their ASG hybrids, whereas contrasting trends were evident for Pioneer hybrids. Silage fermentation indices were largely unaffected by hybrid SG ranking, maturity, or source. Yeast counts increased with maturity and exceeded 10(5) cfu/g; therefore, all silages deteriorated with 26 h, irrespective of treatment. Among the hybrids examined, the optimal maturity for optimizing DM yield and nutritive value of the ASG and HSG hybrids was 37% DM. Stay-green ranking had maturity-dependent effects on the yield of hybrids but had varying effects on nutritional value depending on the source of the hybrid.Keywords
Funding Information
- The Southeast Milk Check-Off
This publication has 18 references indexed in Scilit:
- Effects of forage maize type and maturity stage on in vitro rumen fermentation characteristicsNJAS: Impact in Agricultural and Life Sciences, 2008
- Influence of Ensiling Temperature, Simulated Rainfall, and Delayed Sealing on Fermentation Characteristics and Aerobic Stability of Corn SilageJournal of Dairy Science, 2006
- Effect of maize variety harvested at different maturity stages on feeding value and performance of dairy cowsAnimal Research, 2003
- Harvest Date and Hybrid Influence on Corn Forage Yield, Quality, and PreservationAgronomy Journal, 2002
- Stay‐green: A consequence of the balance between supply and demand for nitrogen during grain filling?Annals of Applied Biology, 2001
- Nitrogen Dynamics and the Physiological Basis of Stay‐Green in SorghumCrop Science, 2000
- Stage of maturity, processing, and hybrid effects on ruminal in situ disappearance of whole-plant corn silageAnimal Feed Science and Technology, 2000
- Path Analysis of Stay-Green Trait in MaizeCereal Research Communications, 1998
- A Rapid Method for the Analysis of StarchStarch ‐ Stärke, 1986
- Inhibition of the growth of acid tolerant yeasts by acetate, lactate and propionate and their synergistic mixturesJournal of Applied Bacteriology, 1983