Coulon J B, Lescourret F, Fonty A
Institut National de la Recherche Agronomique, Saint Genès Champanelle, France.
J Dairy Sci. 1996 Jan;79(1):44-9. doi: 10.3168/jds.S0022-0302(96)76332-4.
Individual curves for milk production of 428 cows affected by foot lesions were compared with control curves drawn from data of healthy lactating cows. First, differences were classified into patterns of milk loss, and their distribution was analyzed among the patterns with regard to breed, season, parity, stage of lactation, and milk production. Then, individual milk losses were estimated and analyzed according to the same factors. During early lactation, as during mid to late lactation, no marked modifications of the lactation curves occurred for about one-half of the cases. In 25% of the cases, milk production was affected for an expanded period (medians were 17 wk for early lactation and 12 wk for mid to late lactation). Corresponding median milk losses were 440 and 270 kg, respectively. Summer foot lesions were more severe than winter lesions, regardless of stage of lactation. Milk production at foot lesion onset was a determining factor of the amount and pattern of milk loss only for cases occurring during mid to late lactation.
将428头受足部病变影响奶牛的产奶量个体曲线与从健康泌乳奶牛数据得出的对照曲线进行比较。首先，将差异分类为产奶量损失模式，并分析其在品种、季节、胎次、泌乳阶段和产奶量方面在各模式间的分布。然后，根据相同因素估计并分析个体产奶量损失。在泌乳早期，如同在泌乳中后期一样，约一半病例的泌乳曲线没有明显变化。在25%的病例中，产奶量在较长时期内受到影响（泌乳早期的中位数为17周，泌乳中后期为12周）。相应的产奶量损失中位数分别为440千克和270千克。无论泌乳阶段如何，夏季足部病变比冬季病变更严重。仅对于泌乳中后期发生的病例，足部病变开始时的产奶量是产奶量损失量和模式的决定因素。
