Abstract
The amounts of milk obtained by the use of a milking machine were found to be correlated with the weight of the pigs. Significant correlation coefficients of the weights of pigs with the amounts of milk obtained by machine during the first week through the sixth week were 0.27 (P<.05), 0.24, 0.22, 0.43 (P<.01), 0.45 (P<.01), and 0.78 (P<.01) respectively. It was noted that the correlation coefficient increased rapidly after the third week of lactation. No complete explanation is offered. The correlation coefficients for weights of pigs and amounts of milk received by them as measured by six hourly nursing intervals each week during the first through the sixth week were 0.08, 0.59 (P<.01), 0.62 (P<.01), 0.84 (P<.01), 0.54 (P<.01), and 0.44 (P<.01), respectively. Although the correlation coefficients for the second through the sixth week were significant (P<.01), no explanation was apparent for the high value of 0.84 (P<.01) during the fourth week of lactation. It was found that there were large differ|ences in milk yield between glands, but no individual gland was consistently a large or a small producer. When the milk production of teats from front to rear was studied, no significant difference was found. Neither was there any significant difference in milk yield between glands located on the left and right side. It was found that pigs do not establish themselves on a certain teat (or teats) because of its location or milk production. Their reason for choosing certain teats is not understood. It appeared that the larger pigs, assumed to be more vigorous, emptied their glands more completely when nursing and thus stimulated greater milk production. The nursing frequency was observed to lengthen somewhat with the advance of lactation. Copyright © . .