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Evaluation of ruminal degradability and metabolism of feedlot finishing diets with or without cotton byproducts.
Journal of Animal Science ( IF 3.3 ) Pub Date : 2020-08-10 , DOI: 10.1093/jas/skaa257
Andrea L Warner 1 , Paul A Beck 1 , Andrew P Foote 1 , Kaitlyn N Pierce 1 , Colton A Robison 1 , Nicole E Stevens 1 , Blake K Wilson 1
Affiliation  

Cotton byproducts can be an economical source of protein, fat, and fiber in cattle finishing diets. The objectives of this study were 1) to assess the effects of including whole cottonseed (WCS) and cotton gin trash (CGT) in finishing diets on in situ ruminal degradability and 2) to determine the effects of including cotton byproducts in a finishing diet on rumen fluid pH, lactate, and volatile fatty acid concentrations. Six ruminally cannulated steers were used in a crossover design. Treatments included a control diet (CON; 7% prairie hay [PH], 15% Sweet Bran, 67.25% rolled corn, and 5% liquid supplement) and a cotton byproduct diet (CTN; 7% CGT, 15% WCS, 72.25% rolled corn, and 5% water). Both diets included 0.75% urea and 5% dry supplement. In situ bags containing individual diet ingredients and whole diet samples were incubated in the rumen for up to 96 h. Rumen fluid samples were collected over a 24-h period. No treatment × substrate interactions were detected for any fraction of dry matter (DM) or organic matter (OM) degradability for individual ingredients or whole diets (P ≥ 0.14). The A, B, and C fractions, disappearance rate (Kd), and effective degradability of DM and OM differed between diet ingredients (P ≤ 0.04) but were not different between CON and CTN substrates (P ≥ 0.25). A treatment × substrate interaction (P = 0.04) was detected for the effective degradability of neutral detergent fiber (NDF) of CGT and PH but there was no interaction for other fractions (P ≥ 0.27). The A fraction of NDF was greater (P < 0.001) for CGT than PH; however, the B fraction of NDF tended to be greater (P = 0.08) for PH than CGT. No differences (P ≥ 0.37) were detected for the % NDF disappearance at 48 h between CON and CTN substrates. A tendency for a treatment × substrate interaction (P = 0.10) was observed for the effective degradability of starch among diets; however, when the CON substrate was incubated in steers consuming the CON diet, effective degradability of starch was not different (P = 0.84) from when the CTN diet was incubated in steers consuming the CTN diet. There was no treatment × time interaction or treatment effect for rumen pH; however, there was a time effect (P = 0.03). Steers consuming the CTN diet had greater molar proportions of acetate and decreased molar proportions of propionate compared with CON steers (P < 0.01). This experiment suggests that there are minimal differences between the digestibility of finishing diets containing cotton byproducts and those comprised of traditional finishing diet ingredients.

中文翻译:

有或没有棉花副产品的育肥育肥日粮瘤胃降解性和代谢的评价。

棉花副产品可以成为牛育肥日粮中蛋白质、脂肪和纤维的经济来源。本研究的目的是 1) 评估在育肥日粮中加入全棉籽 ( WCS ) 和轧棉渣 ( CGT ) 对原位瘤胃降解的影响 2) 确定在育肥日粮中加入棉花副产品对瘤胃液 pH、乳酸和挥发性脂肪酸浓度。在交叉设计中使用了六头瘤胃空心公牛。处理包括对照饮食(CON;7% 草原干草 [ PH ]、15% 甜麸、67.25% 玉米卷和 5% 液体补充剂)和棉花副产品饮食(CTN); 7% CGT、15% WCS、72.25% 轧制玉米和 5% 水)。两种饮食都包括 0.75% 的尿素和 5% 的干补充剂。含有个别饲料成分和全饲料样品的原位袋在瘤胃中孵育长达 96 小时。在 24 小时内收集瘤胃液样品。对于单个成分或整个饮食的任何干物质 ( DM ) 或有机物质 ( OM ) 可降解性,未检测到处理 × 底物相互作用( P ≥ 0.14)。A、B 和 C 组分、消失率 (Kd) 以及 DM 和 OM 的有效降解性在日粮成分之间存在差异 ( P ≤ 0.04),但在 CON 和 CTN 底物之间没有差异 ( P ≥ 0.25)。A处理×底物相互作用(P= 0.04) 检测到CGT 和 PH的中性洗涤纤维 ( NDF )的有效降解性,但其他部分没有相互作用 ( P ≥ 0.27)。对于 CGT ,NDF 的 A 分数大于 PH (P < 0.001);然而,对于 PH ,NDF 的 B 分数往往大于 CGT (P = 0.08)。在 48 小时 CON 和 CTN 底物之间的 NDF 消失百分比没有检测到差异(P ≥ 0.37)。对于日粮中淀粉的有效降解性,观察到处理×底物相互作用的趋势(P = 0.10);然而,当 CON 底物在食用 CON 饮食的公牛中孵育时,淀粉的有效降解没有不同(P= 0.84) 从当 CTN 饮食在消耗 CTN 饮食的阉牛中孵化时开始。瘤胃pH值没有处理×时间相互作用或处理效果;然而,存在时间效应(P = 0.03)。与 CON 公牛相比,食用 CTN 饲料的公牛具有更高的醋酸摩尔比例和更低的丙酸摩尔比例(P < 0.01)。该实验表明,含有棉花副产品的育肥日粮与传统育肥日粮成分的消化率差异很小。
更新日期:2020-09-12
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