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Effects of short-term once-a-day milking in early lactation on dairy cow performance when managed in a seasonal-calving pasture based system
Livestock Science ( IF 1.8 ) Pub Date : 2021-07-30 , DOI: 10.1016/j.livsci.2021.104648
Emer Kennedy 1 , John Paul Murphy 1 , Luc Delaby 2 , Michael O'Donovan 1
Affiliation  

The availability of labour during a compact calving period, can pose a challenge to dairy farmers. The objective of this study was to investigate, in comparison to twice-a-day (TAD) milking, the effect of short-term once-a-day (OAD) milking for four (OAD4), six (OAD6) or eight (OAD8) weeks directly post-calving on milk production, cow health and welfare. After each treatment finished their respective time on OAD milking cows reverted back to TAD milking for the remainder of lactation. A milk yield reduction of 21% was observed after the first four-weeks of lactation when milking OAD compared to TAD (618 kg/cow). When OAD milking continued until week six or eight of lactation milk yield reduction increased to 24 and 26%, respectively, compared to TAD. Following the 35-week lactation OAD6 (4,913 kg/cow) and OAD8 (4,815 kg/cow) treatments had a lower cumulative milk yield compared to the TAD cows (5,300 kg/cow); OAD4 were similar to all treatments (5,073 kg/cow). Following the first four weeks of the experiment the TAD herd had a higher milk fat, protein and lactose yield (+0.29, +0.17 and 0.28 kg/cow/day, respectively) than the three OAD herds which were not significantly different to each other (1.19, 0.72 and 0.95 kg/cow/day, respectively). Total milk fat, protein and lactose yields for the first six weeks of lactation were similar for all OAD treatments (44, 28 and 38 kg/cow, respectively) compared to the TAD treatment (54, 33,and 47 kg/cow, respectively). Following the first eight-weeks of lactation milk fat, protein and lactose yields were highest for the TAD (72, 45 and 65 kg/cow, respectively); OAD6 and OAD 8 were similar, OAD4 was similar to OAD6 but higher than OAD8. There was no difference in kg fat + kg protein (MSY) between treatments at the end of lactation. During the first four weeks of lactation milking cows OAD increased (+ 0.95 units) somatic cell score (SCS) compared to cows being milked TAD (3.26 units). From week five of lactation onwards there was no difference in SCS between any of the treatments. Milking time was consistently less (up to 35% less) when cows were milked OAD compared to TAD. The likelihood of milk leakage from udders pre-milking was significantly higher with OAD compared to TAD milking. There was no effect of treatment on locomotion score or fertility. The results of this study indicate that OAD milking for a short period of time in early lactation may be a viable option to reduce labour requirements without having a negative impact on cow milk production or welfare indicators.



中文翻译:

在基于季节性产犊牧场的系统中管理时,泌乳早期短期每天一次挤奶对奶牛生产性能的影响

在紧凑的产犊期间劳动力的可用性可能对奶农构成挑战。本研究的目的是调查与每天两次 (TAD) 挤奶相比,短期每天一次 (OAD) 挤奶对四人 ( OAD4 )、六人 ( OAD6 ) 或八人 ( OAD6 ) 的影响。OAD8) 产犊后几周直接影响产奶量、奶牛健康和福利。在每次处理结束各自在 OAD 上的时间后,奶牛在剩余的泌乳期间恢复到 TAD 挤奶。与 TAD(618 公斤/头奶牛)相比,在前 4 周的泌乳期后观察到 OAD 挤奶时的产奶量减少了 21%。与 TAD 相比,当 OAD 挤奶持续到泌乳第 6 周或第 8 周时,产奶量分别增加到 24% 和 26%。在 35 周泌乳期后,与 TAD 奶牛(5,300 千克/头牛)相比,OAD6(4,913 千克/头牛)和 OAD8(4,815 千克/头牛)处理的累积产奶量较低;OAD4 与所有处理相似(5,073 公斤/头牛)。在实验的前四个星期后,TAD 牛群的乳脂、蛋白质和乳糖产量更高(+0.29、+0.17 和 0.28 公斤/奶牛/天,分别)而不是彼此没有显着差异的三个 OAD 牛群(分别为 1.19、0.72 和 0.95 公斤/牛/天)。与 TAD 处理(分别为 54、33 和 47 千克/牛)相比,所有 OAD 处理(分别为 44、28 和 38 千克/头牛)的泌乳前六周的总乳脂、蛋白质和乳糖产量相似)。在哺乳期的前 8 周后,TAD 的乳脂、蛋白质和乳糖产量最高(分别为 72、45 和 65 公斤/头);OAD6和OAD 8相似,OAD4与OAD6相似但高于OAD8。在泌乳结束时,处理之间的公斤脂肪 + 公斤蛋白质 (MSY) 没有差异。与被挤奶的奶牛 TAD(3.26 单位)相比,泌乳奶牛的前 4 周 OAD 增加(+ 0.95 单位)体细胞评分(SCS)。从泌乳第 5 周开始,任何治疗之间的 SCS 都没有差异。与 TAD 相比,使用 OAD 挤奶的奶牛的挤奶时间始终较短(最多减少 35%)。与 TAD 挤奶相比,OAD 挤奶前乳房漏奶的可能性显着更高。治疗对运动评分或生育力没有影响。这项研究的结果表明,在泌乳早期短时间的 OAD 挤奶可能是减少劳动力需求而不会对牛奶产量或福利指标产生负面影响的可行选择。与 TAD 挤奶相比,OAD 挤奶前乳房漏奶的可能性显着更高。治疗对运动评分或生育力没有影响。这项研究的结果表明,在泌乳早期短时间的 OAD 挤奶可能是减少劳动力需求而不会对牛奶产量或福利指标产生负面影响的可行选择。与 TAD 挤奶相比,OAD 挤奶前乳房漏奶的可能性显着更高。治疗对运动评分或生育力没有影响。这项研究的结果表明,在泌乳早期短时间的 OAD 挤奶可能是减少劳动力需求而不会对牛奶产量或福利指标产生负面影响的可行选择。

更新日期:2021-08-15
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