Effect of insect-protected maize silage(Bt-MON810) on feeding value and digestibility of nutrients estimated with wethers
2009
Křížová, L., Research Institute for Cattle Breeding, Ltd., Rapotín (Czech Republic) | Svobodová, J., Research Institute for Cattle Breeding, Ltd., Rapotín (Czech Republic) | Pavlok, S., Research Institute for Cattle Breeding, Ltd., Rapotín (Czech Republic) | Třináctý, J., Research Institute for Cattle Breeding, Ltd., Rapotín (Czech Republic) | Nedělník, J., Research Institute for Fodder Crops, Ltd., Troubsko (Czech Republic) | Kocourek, F., Crop Research Institute, Praha – Ruzyně (Czech Republic)
The objective of this study was to compare the feeding value of conventional maize silage with its isogenic Bt form in digestibility trial on wethers. In 2006, two maize hybrids, MONUMENTAL (C) and Bt-MON810(Bt) were planted at the area of Ivanovice na Hané, Czech Republic under comparable conditions. Maize plants were harvested at soft-dough stage of maturity and ensiled into mini-silos (2 cubic m). Silages were used in a digestibility trial with 10 Suffolk wethers with an average live weight of 45.3 plus minus 1.35 kg that were divided into two groups. The experiment was carried out in two periods of 14 days (7-d preliminary period and 7-d collection period). In the fresh maize forage the content of crude protein in C (74.0 g per kg DM) was higher than in Bt (71.0 g per kg DM, P less than 0.05) and the content of acid detergent fiber (ADF) was lower in C in comparison to Bt (205.8 vs. 210.1 g per kg DM, respectively, P less than 0.05). Content of nutrients in silages was unaffected by the maize hybrid (P more than 0.05). No effect of the maize hybrid on fermantation process was observed (P more than 0.05) except of ethanol content that was lower in Cand acetic acid content that was higher in Ccompared to Bt (P less than 0.05). Intake of dry matter (DM) was similar in both groups (P more than 0.05). Digestibility of crude fiber and nitrogen-free extractives was lower in C(34.4 and 74.1%) than in Bt (40.0 and 76.4%, respectively, P less than 0.05). Haematological characteristics of animals were unaffected by the type of silage (P more than 0.05).
显示更多 [+] 显示较少 [-]