61 Effects of botanical composition on grazing system management, forage quality, forage availability, and ewe performance
Journal of Animal Science(2024)
摘要
Abstract The objective was to compare the effects of two forage mixtures utilized in a rotational grazing system on ewe performance, forage quality, and forage availability. Dorset-Suffolk crossbred ewes [n = 48; body weight (BW) = 187 ± 20 kg] were stratified by BW, body condition score (BCS), and age, then allotted to six groups. Groups were randomly assigned to one of two treatments: forage mixture 1 (FM1; 47% orchard grass, 30% white clover, 14% brome grass, and 9% ryegrass) and forage mixture 2 (FM2; 44% ryegrass, 33% white clover, and 23% red clover). There were 18 paddocks (30.5 m x 22 m) for each treatment, each group was rotated between one of six paddocks; the rotation of each group was determined by the reduction of forage height to approximately 10 cm. Ewe BW and BCS were collected on d 0, 14, and 28. Forage heights were measured using meter sticks upon the groups entering and exiting each paddock. Forage heights were used to calculate forage availability, and the difference between pre-grazing and post-grazing forage availability was assumed to be forage disappearance. Five pre-grazing forage samples from each paddock were clipped at 10 cm using the forage square (0.0625 m²) to determine fiber content. Data were analyzed using the GLM procedure of SAS 9.4. No effects on ewe BW or BCS were observed (P = 0.4134) between treatments. Ewes grazing FM2 spent more time grazing each paddock (P < 0.01) compared with ewes grazing FM1. Pre-grazing forage ground cover (P < 0.01) was greater in FM2 compared with FM1; however, grazed forage mass disappearance was not different (P = 0.44) between treatments. The NDF and ADF values were greater for FM1 than FM2 (P < 0.01 and P = 0.02, respectively) indicating that more forage is needed to meet ewe energy requirements. Results suggest that neither forage mixture had a significant impact on ewe BW or BCS; however, ewes grazing FM2 maintained themselves on a smaller land area during growing season, making it a more feasible option for rotational grazing management.
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