Ciordia H, Stuedemann J A, Wilkinson S R, McCampbell H C, Caudle A B, Ernst J V
Am J Vet Res. 1985 Mar;46(3):566-9.
Over a 2-year period involving a total of 168 Angus cows and their calves, 2 studies were conducted to evaluate the effect of once-daily suckling on cow reproduction, calf growth, and gastrointestinal parasitism. Experiment I compared 2 restricted suckling (RS) groups with 1 normal suckling (NS) group. Each group consisted of 24 cows with their calves (24 cows-calves/group = 24 cows and 24 calves/group). In the RS groups, suckling by the calves was restricted to once a day for 45 days, and then the calves were allowed to suckle normally throughout the remainder of the experiment. In the NS group, the calves suckled normally throughout the experiment. Experiment II compared 2 groups of RS cow-calves (24 cow-calves/group) with 2 groups of 24 NS cow-calves/group. In experiment I, there were no differences (P less than 0.05) in pregnancy rate or in the average number of nematode eggs/g of feces (epg) between the cows from the 2 treatment groups. The RS calves consistently had higher epg counts than did the NS calves during the 45 days of RS (169 vs 62 epg, P less than 0.05) and from the time of their return to pasture until weaning (266 vs 186 EPG, P = 0.27). The RS calves also had a higher average coccidia oocyst count during the RS period only. In experiment II, RS cows had a higher pregnancy rate (87.6% vs 66.0%, P less than 0.05) and a shorter postpartum interval (83 vs 101 days, P less than 0.05) than did NS cows.(ABSTRACT TRUNCATED AT 250 WORDS)
在一项为期两年、共涉及168头安格斯母牛及其犊牛的研究中，开展了两项试验，以评估每日一次哺乳对母牛繁殖、犊牛生长和胃肠道寄生虫感染情况的影响。试验I将两个限制哺乳（RS）组与一个正常哺乳（NS）组进行了比较。每个组由24头母牛及其犊牛组成（每组24对母牛 - 犊牛 = 每组24头母牛和24头犊牛）。在RS组中，犊牛的哺乳被限制为每天一次，持续45天，然后在试验的剩余时间里犊牛可以正常哺乳。在NS组中，犊牛在整个试验过程中正常哺乳。试验II将两组RS母牛 - 犊牛（每组24对）与两组每组24头的NS母牛 - 犊牛进行了比较。在试验I中，两个处理组的母牛在妊娠率或每克粪便中线虫卵数（epg）的平均值方面没有差异（P < 0.05）。在RS的45天内，RS犊牛的epg计数始终高于NS犊牛（169对vs 62 epg，P < 0.05），并且从它们回到牧场到断奶期间也是如此（266对186 EPG，P = 0.27）。仅在RS期间，RS犊牛的平均球虫卵囊计数也更高。在试验II中，RS母牛的妊娠率更高（87.6%对66.0%，P < 0.05），产后间隔更短（83天对101天，P < 0.05），高于NS母牛。（摘要截断于250字）
