Iqbal Muhammad A, Ahmad Tanveer, Ahmad Muhammad S, Aftab Usama, Mukhtar Nasir
Department of Livestock Production and Management, PMAS Arid Agriculture University, Rawalpindi, Pakistan.
University Institute of Biochemistry and Biotechnology, PMAS Arid Agriculture University, Rawalpindi, Pakistan.
Poult Sci. 2025 Jul;104(7):105075. doi: 10.1016/j.psj.2025.105075. Epub 2025 Mar 19.
Rice protein meal (RPM), a byproduct of the rice industry, has emerged as a potential alternative for poultry feed, especially in rice-producing regions in the South Asia region. The aim of this study was to evaluate the standardized ileal amino acid (AA) digestibility of RPM produced from two distinct rice varieties in sexed broiler chickens, with or without the inclusion of a commercial protease enzyme. Treatments were structured in a 2 × 2 × 2 factorial arrangement, including two sources of RPM (Basmati and IRI), sex (male and female), and protease levels (0 and 500 units per ton of feed). In addition to the test diets, a reference diet based on soybean meal (SBM) and a nitrogen-free diet (NFD) were included in the experiment. Titanium dioxide was added on 0.30% of the diets as an inert marker. Experimental diets were fed to 6 replicates, each consisting of male and female chicks, from 21 to 28 days of age. The data were analyzed using General Linear Model techniques with the help of SPSS 16.0. The main effect of varieties was significant (P < 0.05), as the standardized ileal digestibility (SID) of lysine (57.8%) and threonine (50.7%) was higher for Basmati compared to IRI. The SID for arginine was lower (P = 0.02), and the SID of cysteine (14.4%), isoleucine (47.3%), leucine (46.1%), valine (45.2%), and histidine (49.6%) tended to be lower (P < 0.07) in females for RPM derived from Basmati rice. Protease had no effect on the SID of AA, nor did any of the other three- or two-way interactions.
大米蛋白粉（RPM）是大米产业的一种副产品，已成为家禽饲料的一种潜在替代品，尤其是在南亚地区的水稻种植区。本研究的目的是评估由两个不同水稻品种生产的RPM在性别区分的肉鸡中，添加或不添加商业蛋白酶时的标准回肠氨基酸（AA）消化率。试验处理采用2×2×2析因设计，包括两种RPM来源（巴斯马蒂香米和国际水稻研究所品种）、性别（雄性和雌性）以及蛋白酶水平（0和每吨饲料500单位）。除了试验日粮外，试验还包括一种基于豆粕（SBM）的对照日粮和一种无氮日粮（NFD）。在日粮中添加0.30%的二氧化钛作为惰性标记物。从21日龄至28日龄，将试验日粮饲喂给6个重复组，每组包含雄性和雌性雏鸡。借助SPSS 16.0软件，使用一般线性模型技术对数据进行分析。品种的主效应显著（P<0.05），因为与国际水稻研究所品种相比，巴斯马蒂香米的赖氨酸（57.8%）和苏氨酸（50.7%）的标准回肠消化率（SID）更高。精氨酸的SID较低（P = 0.02），并且对于源自巴斯马蒂香米的RPM，雌性的半胱氨酸（14.4%）、异亮氨酸（47.3%）、亮氨酸（46.1%）、缬氨酸（45.2%）和组氨酸（49.6%）的SID趋于更低（P<0.07）。蛋白酶对AA的SID没有影响，其他任何三因素或双因素交互作用也没有影响。
