Hombegowda Gangavadi P, Suresh Bypanahalli N, Shivakumar Mysore C, Ravikumar Puttamallappa, Girish Bekkere C, Rudrappa Satturu M, Indresh Huchamanadoddi C
Veterinary College, Karnataka Veterinary, Animal and Fisheries Sciences University, Hassan - 573 202, India.
Veterinary College, KVAFSU, Bangalore - 560 024, India.
Anim Biosci. 2021 Dec;34(12):1951-1962. doi: 10.5713/ab.20.0844. Epub 2021 Apr 23.
This study was conducted to evaluate single cell protein (SCP), produced from Methylococcus species, as a protein source on the growth performance, carcass traits and gut health of broiler chickens.
Ten iso-nitrogenous and iso-caloric diets containing 0 (Control), 2.5%, 5%, 7.5%, and 10% SCP replacing either soybean meal (T1 to T5) or fish meal (T6 to T10) were formulated. Each diet prepared for starter (0 to 14 days), grower (15 to 21 days), and finisher (22 to 42 days) phases was offered to four replicates of 10 chicks each (n = 400). Growth performance at different phases and carcass characteristics and intestinal morphology on 42nd day of trial were measured.
Body weight gain in groups fed 2.5% and 5% SCP diets were comparable to control during different phases and cumulatively, however lower (p<0.01) in 7.5% and 10% SCP diets. Feed conversion ratio was better (p<0.01) in 2.5% and 5% SCP diets. Dressing percentage, abdominal fat percentage and meat:bone ratio were not affected (p>0.05) by SCP inclusion in the diets. However, breast percentage was higher (p<0.01) in 2.5% and 5% SCP groups and thigh percentage higher in 7.5% and 10% SCP groups. Total microbial count in duodenum, jejunum and ileum were not affected (p>0.05) by SCP inclusion up to 10% in diets. Duodenal villi length and crypt depth were highest (p<0.01) in group fed 5% SCP diets and lowest in group fed 10% SCP diets. Jejunal villi length and crypt depth as well as ileal villi length were lowest (p<0.01) in group fed 10% SCP diets. Body weight gain, feed consumption, feed conversion ratio and gut health were better (p<0.01) in broilers fed fish meal based diets compared to soybean meal based diets.
It was concluded that inclusion of SCP up to 5% replacing soybean meal in broiler diets is beneficial in improving growth rate, breast yield and gut health status.
本研究旨在评估由甲基球菌属产生的单细胞蛋白（SCP）作为蛋白质来源对肉鸡生长性能、胴体性状和肠道健康的影响。
配制十种等氮等热的日粮，分别含有0（对照）、2.5%、5%、7.5%和10%的SCP，替代豆粕（T1至T5）或鱼粉（T6至T10）。为雏鸡（0至14天）、中鸡（15至21天）和大鸡（22至42天）阶段准备的每种日粮分别提供给四个重复组，每组10只雏鸡（n = 400）。测定不同阶段的生长性能以及试验第42天的胴体特征和肠道形态。
在不同阶段及累积计算时，饲喂2.5%和5% SCP日粮组的体重增加与对照组相当，但在7.5%和10% SCP日粮组中较低（p<0.01）。2.5%和5% SCP日粮组的饲料转化率更好（p<0.01）。日粮中添加SCP对屠宰率、腹脂率和肉骨比没有影响（p>0.05）。然而，2.5%和5% SCP组的胸肉率较高（p<0.01），7.5%和10% SCP组的腿肉率较高。日粮中SCP添加量高达10%时，十二指肠、空肠和回肠的总微生物计数不受影响（p>0.05）。饲喂5% SCP日粮组的十二指肠绒毛长度和隐窝深度最高（p<0.01），饲喂10% SCP日粮组的最低。饲喂10% SCP日粮组的空肠绒毛长度和隐窝深度以及回肠绒毛长度最低（p<0.01）。与以豆粕为基础的日粮相比，以鱼粉为基础的日粮喂养的肉鸡的体重增加、采食量饲料转化率和肠道健康状况更好（p<0.01）。
得出的结论是，在肉鸡日粮中添加高达5%的SCP替代豆粕有利于提高生长速度、胸肉产量和肠道健康状况。
