Influence of hybrid, moisture, and length of storage on the fermentation profile and starch digestibility of corn grain silages

Autor(es)

Fernandes, Juliana ^[1] ; da Silva, Erica Benjamim ^[1] ; Carvalho-Estrada, Paula De Almeida ^[1] ; Pratti Daniel, Joao Luiz ^[2] ; Nussio, Luiz Gustavo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Coll Agr Luiz de Queiroz, Anim Sci Dept, BR-13418900 Piracicaba, SP - Brazil

^[2] Univ Estadual Maringa, Anim Sci Dept, BR-87020900 Maringa, Parana - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANIMAL FEED SCIENCE AND TECHNOLOGY; v. 271, JAN 2021.
• Citações Web of Science: 0

Resumo

The ensiling process, as well as the hybrid type and moisture content of corn grains, can affect the fermentation profile and nutrient digestibility of grain silages. Therefore, this study evaluated the effects of hybrid type, grain moisture content at harvest, and length of storage on the fermentation profile, DM digestibility (DMD), and starch digestibility (StarchD) of corn grain silages. We evaluated corn grains harvested at three moisture contents: at approximately 500 g/kg DM (500DM); high-moisture corn at approximately 700 g/kg DM (HMC); and dry grain at approximately 800 g/kg DM, reconstituted to approximately 700 g/kg DM (RC). At RC and HMC, the flint hybrid had an average of 24 % higher (P < 0.05) zein content than that of the soft hybrid prior to ensiling, but after 7 d of ensiling, there were no differences in zein content between hybrids. The StarchD at 12 h and 24 h was negatively correlated with the zein content (P < 0.01, R-2 = 0.84 and R-2 = 0.87, respectively) and positively correlated with the concentrations of ammonia nitrogen (P < 0.01, R-2 = 0.81 and R-2 = 0.77, respectively) and SP (P < 0.01, R-2 = 0.88 and R-2 = 0.80, respectively). After 60 d of ensiling, the DMD and StarchD at 24 h were similar for all silages, independent of the hybrid type or moisture content. After 7 d of ensiling, the RC silages had a higher (P < 0.05) pH (4.90 vs. 4.24), ethanol content (9.29 vs. 5.29 g/kg DM), and 2,3-butanediol content (8656.71 vs. 782.76 mg/kg DM) than those of the HMC silages. After 21 d of ensiling, the RC silages had a higher (P < 0.05) DM losses (58.3 vs. 21.4 g/kg) and acetone content (78.11 vs. 4.60 mg/kg DM) than those of the HMC silages. After 60 d of ensiling, the RC silages had a higher (P < 0.05) butyric acid content (1355.48 vs. 7.98 mg/kg DM) than that of the HMC silages. In conclusion, ensiling HMC and RC for 60 d reduced the negative effects of high vitreousness on the DMD and StarchD due to the proteolysis of the prolamin matrix. (AU)

• Processo FAPESP: 12/15184-7 - Características físico-químicas e atividade da matriz proteica em grãos de milho para silagem sob o efeito de maturidade e textura do endosperma
• Beneficiário: Juliana Fernandes
• Modalidade de apoio: Bolsas no Brasil - Mestrado