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Functional diversity vs. monotony: the effect of a multiforage diet as opposed to a single forage diet on animal intake, performance, welfare, and urinary nitrogen excretion
Journal of Animal Science ( IF 3.3 ) Pub Date : 2021-02-24 , DOI: 10.1093/jas/skab058
Konagh Garrett 1 , Matt R Beck 1 , Cameron J Marshall 1 , Anita E Fleming 1 , Chris M Logan 1 , Thomas M R Maxwell 1 , Andrew W Greer 1 , Pablo Gregorini 1
Affiliation  

The objective of this study was to determine the effect of offering animals a multiforage choice (MF) of fresh herbages on dry matter intake (DMI), live weight gain, and animal welfare, in comparison with a monotonous diet of ryegrass (Lolium perenne L.). Twenty ram lambs (30.5 ± 0.9 kg initial live weight; mean ± SEM), were randomly allocated to either a diet consisting of diverse MF choice or a single forage ryegrass (SF) diet (n = 10 per treatment) for 35 d. Both diets were fed ad libitum; however, the MF diet was composed of set dry matter ratios of 24% chicory (Cichorium intybus L.), 30% lucerne (Medicago sativa L.), 25% plantain (Plantago lanceolata L.), and 21% ryegrass. The DMI of the MF lambs was 48% greater (P < 0.01) and the within animal day-to-day coefficient of variation (CV) of intake was 26% lower (P < 0.01) than the SF lambs. The average daily gain (ADG) of lambs offered the MF diet was 92% greater (P < 0.01) than the lambs offered the SF diet. The within-animal day-to-day CV of intake was negatively related to ADG (r = −0.59; P < 0.01). The MF lamb’s urinary N concentration was 30% lower (P < 0.01) than that of the SF lambs. The SF lambs spent more time (P < 0.05) exhibiting stereotypic behaviors in the afternoon and spent more time observing other animals than the MF. Overall, allocating an MF choice of fresh herbages as opposed to a single forage diet of ryegrass increases DMI and thereby animal performance, while potentially reducing urinary N excretion.

中文翻译:

功能多样性与单调:多草料饮食与单一草料饮食对动物摄入、性能、福利和尿氮排泄的影响

本研究的目的是确定与单调的黑麦草(Lolium perenne L .)。20 只公羊羔羊(30.5 ± 0.9 kg 初始活重;平均值 ± SEM)被随机分配到由多种 MF 选择组成的饮食或单一饲料黑麦草 (SF) 饮食(每次处理 n = 10)35 天。两种饮食都是随意喂食的;然而,MF 饮食由 24% 的菊苣 (Cichorium intybus L.)、30% 的苜蓿 (Medicago sativa L.)、25% 的车前草 (Plantago lanceolata L.) 和 21% 的黑麦草组成。MF 羔羊的 DMI 高出 48% (P < 0.01),动物内每日摄入变异系数 (CV) 低 26% (P < 0. 01)比SF羔羊。提供 MF 饮食的羔羊的平均日增重 (ADG) 比提供 SF 饮食的羔羊高 92% (P < 0.01)。动物体内每日摄入量 CV 与 ADG 呈负相关(r = -0.59;P < 0.01)。MF 羔羊的尿氮浓度比 SF 羔羊的低 30% (P < 0.01)。与 MF 相比,SF 羔羊在下午表现出刻板行为的时间更多(P < 0.05),并花费更多时间观察其他动物。总体而言,分配 MF 选择新鲜牧草而不是黑麦草的单一草料日粮可增加 DMI,从而提高动物性能,同时可能减少尿氮排泄。动物体内每日摄入量 CV 与 ADG 呈负相关(r = -0.59;P < 0.01)。MF 羔羊的尿氮浓度比 SF 羔羊的低 30% (P < 0.01)。与 MF 相比,SF 羔羊在下午表现出刻板行为的时间更多(P < 0.05),并花费更多时间观察其他动物。总体而言,分配 MF 选择新鲜牧草而不是黑麦草的单一草料日粮可增加 DMI,从而提高动物性能,同时可能减少尿氮排泄。动物体内每日摄入量 CV 与 ADG 呈负相关(r = -0.59;P < 0.01)。MF 羔羊的尿氮浓度比 SF 羔羊的低 30% (P < 0.01)。与 MF 相比,SF 羔羊在下午表现出刻板行为的时间更多(P < 0.05),并花费更多时间观察其他动物。总体而言,分配 MF 选择新鲜牧草而不是黑麦草的单一草料日粮可增加 DMI,从而提高动物性能,同时可能减少尿氮排泄。05)在下午表现出刻板的行为,并花更多的时间观察其他动物而不是 MF。总体而言,分配 MF 选择新鲜牧草而不是黑麦草的单一草料日粮可增加 DMI,从而提高动物性能,同时可能减少尿氮排泄。05)在下午表现出刻板的行为,并花更多的时间观察其他动物而不是 MF。总体而言,分配 MF 选择新鲜牧草而不是黑麦草的单一草料日粮可增加 DMI,从而提高动物性能,同时可能减少尿氮排泄。
更新日期:2021-02-24
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