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Abstract：
The effects of parity and somatic cell count in milk (SCC) threshold on the udder morphology, milkability traits, and milk composition was evaluated in 41 Canarian goats in mid-lactation. The animals were divided according to parity (1st, 2nd, and 3rd), and a SCC threshold of 2000 × 103 cells/mL in milk was set to evaluate the effect of this factor on the different measured parameters. Results showed that primiparous goats had the udder smaller and less distended than multiparous goats, but no differences were detected on milk flow parameters. Furthermore, SCC and total bacterial count (TBC) tended to be higher when the parity increased. On the other hand, goats with SCC ≤ 2000 × 103 had higher cistern-floor distance (CF) and lower TBC values compared with those goats with a count above the predetermined threshold. The results suggest that a reduction in SCC can be achieved by a selection of udder morphological traits. Moreover, milk flow parameters do not seem to be a tool to determine the udder health status in Canarian goats, but long-term studies are needed to verify it.
摘要：
牛奶中的奇偶校验和体细胞计数（SCC）阈值对乳房形态的影响，挤奶特性，在泌乳中期的41只Canarian山羊中评估了牛奶成分。根据胎次划分动物(第1次，2nd,and3rd),并将牛奶中的SCC阈值设定为2000×103个细胞/mL，以评估该因素对不同测量参数的影响。结果表明，初产山羊的乳房较多产山羊更小，扩张程度更小，但是在牛奶流量参数上没有检测到差异。此外，当奇偶校验增加时，SCC和总细菌计数（TBC）趋于更高。另一方面,与数量超过预定阈值的山羊相比，SCC≤2000×103的山羊具有更高的水箱-地板距离（CF）和更低的TBC值。结果表明，通过选择乳房形态性状可以减少SCC。此外，牛奶流量参数似乎不是确定加那利山羊乳房健康状况的工具，但需要长期研究来验证。
