کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2419929 | 1552415 | 2012 | 5 صفحه PDF | دانلود رایگان |
This study evaluated the effect of crude glycerol on feed processing of nursery and finisher diets for pigs. In Exp. 1, complex nursery pig diets were mixed in a double ribbon mixer with glycerol levels of 0, 25, and 50 g/kg replacing maize on a weight basis and pelleted (74 °C conditioning temperature (CT) and 4.4 mm × 29 mm die size). In Exp. 2, finisher diets (maize–soybean meal based with 30 g/kg added fat) were mixed in a double ribbon mixer with glycerol included at 0, 25, and 50 g/kg replacing maize on a weight basis and pelleted (74 °C CT; 4.4 mm × 29 mm die size). A second control feed was pelleted at a standard CT of 85 °C. There were three replications per treatment for Exp. 1 and 2. In Exp. 1, flowability of mash nursery diets improved linearly (P<0.001) with glycerol. For pelleting, electrical consumption decreased linearly (P=0.02), production efficiency (P=0.01), pellet durability index (PDI, P=0.001) and modified PDI (included 3 hexagonal nuts, P<0.001) increased linearly, and hot pellet temperature after the pellet die decreased linearly (P<0.001) with increasing levels of glycerol. In Exp. 2, flowability of mash finisher diets improved linearly with increasing glycerol (P=0.03). For pelleting, increasing glycerol linearly increased pellet mill efficiency (P=0.005) and PDI (P<0.001), and decreased hot pellet temperature (P=0.05). Hot pellet temperature and PDI were greater (P<0.001) and pellet mill efficiency (P=0.06) tended to be greater for CT of 85 °C compared to 74 °C. In conclusion, glycerol supplementation improved flowability of meal and pelleting efficiency of nursery and finishing diets and required the use of a lower pelleting temperature while improving production efficiency and maintaining pellet quality.
Journal: Animal Feed Science and Technology - Volume 175, Issues 3–4, 10 August 2012, Pages 193–197