Poolthajit Sukanya, Srakaew Wuttikorn, Haitook Theerachai, Jarassaeng Chaiwat, Wachirapakorn Chalong
Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand.
Department of Animal Science and Fisheries, Faculty of Agricultural Sciences and Technology, Rajamangala University of Technology Lanna, Nan 55000, Thailand.
Vet Sci. 2022 Jun 23;9(7):314. doi: 10.3390/vetsci9070314.
Eighteen Wagyu crossbred steers (average initial body weight: 596.9 ± 46.4 kg; average age: 36 ± 2.7 months) were subjected to three levels of betaine−biotin−chromium (BBC) supplementation for 98 days before slaughter. Animals were fed a basal diet and BBC supplemented at 0, 3 or 6 g/kg of dry matter (DM). The experimental design was a randomized complete block design by a group of animals with six replicates. The intake and digestibility among treatments were not different (p > 0.05). The average daily gain (ADG) of steers that received BBC at 6 g/kg of DM (0.79 kg/day) tended to be higher (p = 0.07) than that of those receiving BBC at 0 and 3 g/kg/day (0.52 and 0.63 kg/day, respectively). Blood metabolites were not different (p > 0.05) among treatments. Carcass characteristic traits included chilled carcass dressing percentage and loin eye area, while meat quality included drip loss, cooking loss, and Warner-Bratzler shear force were not different (p > 0.05). Back fat thickness tended to be higher (p = 0.07) in steers fed BBC at 6 g/kg. The marbling score did not differ (p > 0.05) among treatments; however, the intramuscular fat content of the longissimus dorsi (LD) on a DM basis was significantly higher (p < 0.05) in steers fed BBC at 6 g/kg (39.8% DM) than in those fed BBC at 0 g/kg (28.2% DM) and at 3 g/kg (29.1% DM). Based on the findings, BBC supplementation had no effect on growth performance and carcass characteristics; however, BBC at 6 g/kg DM increased fat content in LD muscle of finishing Wagyu crossbred steers.
18头和牛杂交阉牛（初始平均体重：596.9±46.4千克；平均年龄：36±2.7个月）在屠宰前98天接受三种水平的甜菜碱-生物素-铬（BBC）补充。动物饲喂基础日粮，并按0、3或6克/千克干物质（DM）补充BBC。实验设计为一组动物的随机完全区组设计，有六个重复。各处理间的采食量和消化率无差异（p>0.05）。接受6克/千克DM的BBC的阉牛平均日增重（ADG）（0.79千克/天）倾向于高于接受0和3克/千克/天的BBC的阉牛（分别为0.52和0.63千克/天）（p=0.07）。各处理间血液代谢物无差异（p>0.05）。胴体特征性状包括冷胴体屠宰率和眼肌面积，而肉质包括滴水损失、烹饪损失和Warner-Bratzler剪切力无差异（p>0.05）。饲喂6克/千克BBC的阉牛背膘厚度倾向于更高（p=0.07）。各处理间大理石花纹评分无差异（p>0.05）；然而，以干物质计，饲喂6克/千克BBC的阉牛背最长肌（LD）的肌内脂肪含量显著高于饲喂0克/千克（28.2%DM）和3克/千克（29.1%DM）的BBC的阉牛（p<0.05）。基于这些发现，补充BBC对生长性能和胴体特征无影响；然而，6克/千克DM的BBC增加了育肥和牛杂交阉牛LD肌肉中的脂肪含量。
