This study suggests that young infected animals represent a great risk for non-infected calves and could be a reason for the increased incidence before first parturition, when approximately half of pregnant heifers are already infected, 20 40% with high PVLs [ 15].
Millar and Herdman (2004) found no change in first parturition dates for deer mice (Peromyscus maniculatus) over an 18-year period in Alberta, Canada.
This suggests that, like domestic and laboratory species [14], [15], the mammary glands of primiparous grey seal females have a lower volume of secretory tissue at first parturition and, thus, a reduced capacity for milk secretion compared to multiparous females.
For statistical analysis purposes, two age categories were established for each animal species (Table 1) in relation to the age at first parturition.
Here we have the first parturition of the Asus Eee Pad Transformer from its retail container.
Up to 60% conception rate was reported while age of cow at first parturition was five years.
We focus our investigation on the lambs' responses as adults to their first parturition, because parturition is a naturally occurring painful event and responses to it may influence ease of birth with potential consequences for offspring health and survival [ 13].
For a second group of young females (N = 4), for whom we could not know birth dates (BD, C, D, E) because they immigrated into the study population as adults, we likewise based age estimates on first reproduction by subtracting 10.5 years from the time of these females' recorded first parturition (Table 1).> -wrap-foot> adenotes a captive female.
We also observed a delay in age at first parturition in females originally captured from the wild.
Inactivation of Nf2 during early gestation also inhibits cell proliferation and causes nursing problems during first parturition.
