摘要
The aim of this is study was to test the hypothesis that corn can be partially replaced by crude glycerin (at a level of 50%) without affecting performance, ingestive behavior, ruminal parameters, meat composition, and fatty acids profile on the meat of heifers. Sixty-four intact plus four rumen cannulated Angus × Nellore heifers (359.0 ± 12.15 kg BW) were used. The cannulated animals received the same diets as the intact ones to determine the ruminal N-NH3 concentration, pH, and chewing activity weekly. All heifers were maintained in Brachiaria brizantha pasture and supplemented with a concentrate containing corn, soybean meal, urea, premixed minerals, and glycerin partially replacing corn. A completely randomized experimental design was used, with two treatments (corn ground or glycerin + corn ground). The inclusion of crude glycerin (high fat) decreased nutrients intake and ruminal N-NH3 concentration in the rumen but increased lipid intake. Inclusion of glycerin had no effect (P > 0.05) on ruminal pH, daily gain, performance, time spent eating, rumination, idling, or water intake. The moisture, ash, and protein contents of meat were not affected (P > 0.05) by crude glycerin intake. Crude glycerin increased saturated fatty acids (C14:0, C16:0, and C18:0) and decreased unsaturated fatty acids (C18:2n6c and C20:1) in meat. Despite the reduction in nutrient intake, we recommend crude glycerin to replace corn in concentrate because glycerin did not impair the performance, meat composition, and ruminal pH. Therefore, crude glycerin is a by-product that can partially replace corn in diets efficiently.
摘要译文
这项研究的目的是检验以下假设：玉米可以被粗甘油部分取代（含量为50％），而不会影响小母牛的肉的生产性能，摄食行为，瘤胃参数，肉成分和脂肪酸谱。使用了六十四只完整的瘤胃加上四只瘤胃空心的安格斯×内罗尔小母牛（359.0±12.15 kg体重）。插管动物接受与完整动物相同的饮食，每周测定瘤胃中的N-NH3浓度，pH和咀嚼活性。所有的小母牛都在Bracharia brizantha牧场中饲养，并补充了含有玉米，豆粕，尿素，预混合矿物质和甘油的玉米浓缩物，部分代替了玉米。使用完全随机的实验设计，进行两种处理（玉米粉或甘油+玉米粉）。粗甘油（高脂肪）的加入减少了瘤胃中养分的摄入和瘤胃中反刍动物的N-NH3浓度，但增加了脂质的摄入。包含甘油对瘤胃pH，日增重，性能，进食时间，反刍，空转或饮水没有影响（P> 0.05）。粗甘油的摄入量不影响肉的水分，灰分和蛋白质含量（P> 0.05）。粗甘油增加了肉中的饱和脂肪酸（C14：0，C16：0和C18：0），减少了不饱和脂肪酸（C18：2n6c和C20：1）。尽管减少了营养摄入，但我们建议使用粗甘油代替浓缩玉米，因为甘油不会损害其性能，肉成分和瘤胃pH值。因此，粗甘油是一种副产品，可以有效地替代日粮中的玉米。
Luís Carlos Vinhas ítavo[1];Camila Celeste Brandão Ferreira ítavo[1];Alexandre Menezes Dias[1];Marina de Nadai Bonin Gomes[1];Gumercindo Loriano Franco[1];Marília Williani Filgueira Pereira[1];Eduardo de Souza Leal[1];Alexandre Guimarães Inácio[1];Camila da Silva Pereira[1];Juliana Antônia Tonetto de Mello[1]. Biofuel by-product can replace partially corn in supplement for Angus × Nellore heifers: productive performance and meat characteristics[J]. Tropical Animal Health and Production, 2021,53(1)