causes of piglet death were determined for 569 piglets that died between birth and weaning out ofa total of2388 born over the second to fourth parity in 124 yorkshire and 109 Yorkshire x Lacombe sow litters. Eight specific causes ofdeath were identified. starvation, crushing by the sow and stillbirths were the three main causes. unidentified causes and piglets euthanized largely because of sow death or injury were of secondary importance. Exposure, congenital abnormalities and disease were of minor importance. In addition, the primary underlying cause of death appears to be a lack of adequate nutrition for the piglets as only 6.3% of the piglets dying during the first 3 d had an increase in body weight and only 15.4% of the piglets dying after day 3 had body weight increases that could be considered as adequate for their age.Key words: Piglets, death, birth, lactation lCauses de la mortalit6 des porcelets de la naissance au sevrage.] Titre abr6g6: Causes de la mortalit6 des porcelets de la naissance au sevrage.Les causes de la mortalit6 ont 6t6 d6termin6es pour 569 porcelets morts entre la nais-

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luteinizing hormone concentration in serum of pregnant gilts on different levels of feed consumption. Can. J. Anim. .Blood serum progesterone (P) and luteinizing hormone (LH) were determined in 31 Lacombe gilts at a 3-to 4-day interval from I 0 to 56 days of pregnancy.

location of the teat suckled, breed and parity on piglet growth. Can. J. Anim. Sci. ti1:929-939. The