Six wether sheep with ruminal and duodenal cannulas were used in a replicated 3 × 3 Latin square to determine the effect of rye grain (from an open-pollinated or a hybrid cultivar) and maize grain from hybrid cultivar inclusion in the diet on ruminal fermentation parameters and nutrient digestion in different gastrointestinal tract compartments. The experimental diets consisted of meadow hay (800 g/day) and a concentrate mixture (300 g/day) that contained rye grain from an open-pollinated cultivar (OPRG), rye grain from a hybrid cultivar (HRG), or maize grain from a hybrid cultivar (MG) as a main energy source. Each experimental period lasted 17 days and consisted of 10 days for diet adaptation and 7 days for data and sample collection. Ruminal fermentation (pH, short-chain fatty acids, and ammonia concentration) and nutrient digestion up to the duodenum (in reticulorumen, omasum, and abomasum), in the intestine, as well as in the total digestive tract was investigated. Mean ruminal pH was higher for MG compared to HRG and OPRG (P<0.01) but did not differ between HRG and OPRG (6.45, 6.35, and 6.29 for MG, HRG, and OPRG, respectively). Treatment did not affect short-chain fatty acid concentration in the rumen, except for the molar proportions of valeric acid and of isovaleric acid of the total short-chain fatty acids, which was or tended to be higher (P≤0.06) for MG compared to HRG and OPRG. Less starch was digested in the gastrointestinal tract up to the duodenum and more in the intestine for MG compared to HRG and OPRG (P=0.01); however, total tract nutrient digestibility did not differ between treatments. In conclusion, usage of rye grain in sheep diets resulted in a lower ruminal pH compared to maize grain usage. No differences for ruminal fermentation, nutrient digestion up to the duodenum, in the intestine, as well as in the total digestive tract between rye grain from open-pollinated and hybrid cultivar usage in sheep diets were found.

中文翻译：

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日粮中使用不同品种黑麦粒或玉米粒对绵羊瘤胃发酵参数和养分消化率的影响

在复制的3×3拉丁方中使用六只带有瘤胃和十二指肠插管的绵羊，以测定黑麦谷物（来自开放授粉或杂交品种）和来自混合品种的玉米籽粒对瘤胃发酵参数的影响和不同消化道隔室的营养物质消化。实验饮食包括草地干草（800克/天）和浓缩混合物（300克/天），其中包含来自开放授粉品种（OPRG）的黑麦谷物，来自杂交品种（HRG）的黑麦谷物或玉米谷物来自混合品种（MG）作为主要能源。每个实验期持续17天，包括10天的饮食适应和7天的数据和样本收集。瘤胃发酵（pH，短链脂肪酸，和氨浓度）和营养物质的消化直至十二指肠（网状，胃，胃和厌胃），肠道以及整个消化道。与HRG和OPRG相比，MG的平均瘤胃pH值更高（P <0.01），但HRG和OPRG之间无差异（MG，HRG和OPRG分别为6.45、6.35和6.29）。除总短链脂肪酸中戊酸和异戊酸的摩尔比例与MG相比或趋于更高（P≤0.06）之外，治疗不影响瘤胃中的短链脂肪酸浓度。 HRG和OPRG。与HRG和OPRG相比，MG在胃肠道至十二指肠消化的淀粉更少，肠中消化的淀粉更多（P = 0.01）。但是，不同处理之间的总养分消化率没有差异。结论，与玉米谷物相比，在绵羊饲料中使用黑麦谷物导致瘤胃pH值较低。在绵羊日粮中，使用开放授粉的黑麦谷物和混合品种的黑麦谷物的瘤胃发酵，直至十二指肠的营养消化以及肠道的总消化道都没有差异。