Citlali Anais Castro Jaime, María Magdalena Crosby Galvan, Juan Andrés Burgueño Ferreira, Rodolfo Ramírez Valverde, Juan Daniel Jiménez Rosales, Ricardo Daniel Améndola Massiotti
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The experimental units were groups of six cows in winter (a total of 18 cows) and five cows in spring-summer (a total of 15 cows), additionally their respective grazed areas were also considered as experimental units. The design used was a three × three (treatments × periods) cross-over; the allotment of groups to the treatments was consecutive and randomized. The management criterion of rotational grazing was 8 cm of residual forage height for all treatments. Each time the target height of residual herbage was reached, the portable electric fence was manually moved forward allowing on average 36 m<sup>2</sup> fresh pasture. In winter, intake was not different (P < 0.5) between treatments; however, during spring-summer it was 8% lower (P < 0.005) with AM supplementation. There was no effect (P > 0.5) of treatments on total grazing time, rumination and other activities. 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引用次数: 0
摘要
目的是评估新西兰荷斯坦奶牛在一天中不同时间补充精料对牧草摄取量和摄食行为的影响。在紫花苜蓿与鸭茅牧场放牧制奶系统中,分别于冬季和春夏两季进行试验。分别在上午挤奶后的上午、下午挤奶后的下午和两次挤奶后的上午-下午对照组平均分配5 kg DM精料奶牛-1 d-1。试验单位为冬季6头奶牛组(共18头)和春夏5头奶牛组(共15头),并以各自放牧区域为试验单位。采用3 × 3(处理×期)交叉设计;治疗组的分配是连续和随机的。各处理轮流放牧的管理标准为剩余牧草高度8 cm。每次达到残草目标高度时,手动移动便携式电动围栏,平均允许36 m2的新鲜牧草。冬季采食量对总放牧时间、反刍和其他活动无显著影响(p0.5)。综上所述,春夏补饲AM以晚放牧为主,在养分浓度最高的时段利用牧草。
Timing of supplementation on intake and grazing behavior dairy cows.
The objective was to evaluate the response of New Zealand Holstein cows to concentrate supplementation at contrasting times of the day on herbage intake and ingestive behavior. Two experiments were conducted in winter and spring-summer in a grazing dairy production system of Medicago sativa L. with Dactylis glomerata L. pastures. Three moments of supplying 5.0 kg DM concentrate cow-1 d-1 were used: AM after morning milking, PM after afternoon milking, and the AM-PM control equally dividing that amount after both milkings. The experimental units were groups of six cows in winter (a total of 18 cows) and five cows in spring-summer (a total of 15 cows), additionally their respective grazed areas were also considered as experimental units. The design used was a three × three (treatments × periods) cross-over; the allotment of groups to the treatments was consecutive and randomized. The management criterion of rotational grazing was 8 cm of residual forage height for all treatments. Each time the target height of residual herbage was reached, the portable electric fence was manually moved forward allowing on average 36 m2 fresh pasture. In winter, intake was not different (P < 0.5) between treatments; however, during spring-summer it was 8% lower (P < 0.005) with AM supplementation. There was no effect (P > 0.5) of treatments on total grazing time, rumination and other activities. In conclusion, AM supplementation in spring-summer resulted in dominant evening grazing, and herbage was utilized at its time of highest nutrient concentration.
期刊介绍:
Tropical Animal Health and Production is an international journal publishing the results of original research in any field of animal health, welfare, and production with the aim of improving health and productivity of livestock, and better utilisation of animal resources, including wildlife in tropical, subtropical and similar agro-ecological environments.