A virus has been recovered from the feces of two children having symptoms similar to those of poliomyelitis. The virus is pathogenic for suckling mice and hamsters but not for rhesus monkeys. It induces striking lesions in the skeletal muscles of the experimental animal but not in the central nervous system. Other viruses inducing similar signs and lesions in suckling mice have been isolated fr...

Recent behavioral and physiologic observations of infants and mothers have shown them ready to begin interacting in the first minutes of life. Included among these findings are the newborn infant's ability to crawl toward the breast to initiate suckling and mother-infant thermoregulation. The attachment felt between mother and infant may be biochemically modulated through oxytocin; encouraging ...

BACKGROUND A discrete time, stochastic, compartmental model simulating the spread of Mycoplasma hyopneumoniae within a batch of industrially raised pigs was developed to understand infection dynamics and to assess the impact of a range of husbandry practices. A 'disease severity' index was calculated based on the ratio between the cumulative numbers of acutely and chronically diseased and infec...

The problem of postpartum anoestrus is a real one because it results in prolongation of the time between calvings. The interval between the calving and resumption of cyclic ovarian activity depends on several factors, i.e., amount of feeding before and after parturition, level of milk yield, age of the animal, calving difficulty, presence of a bull in the herd, season and its photoperiodism and...

It has been shown that L-carnitine supplementation of sows increases their milk production and the postnatal growth of the suckling piglets. To test the hypothesis that this effect is due to an improved suckling behaviour of the piglets, two experiments with sows were performed. Two groups of thirteen or ten sows each (in experiments 1 and 2, respectively) were fed diets with or without supplem...

[3H]thymidine uptake and colony counts are quantitative and inexpensive methods for studying Spiroplasma growth. Using these techniques, we demonstrated subtle effects on the growth of suckling mouse cataract agent of medium alterations, inoculum size, and freezing of cultures. In addition, suckling mouse cataract agent multiplied more actively under aerobic than under anaerobic conditions. The...

Abstract Fostering and allo-suckling are widespread among pinnipeds, several hypotheses have been formulated to explain their occurrence. Here, we describe the occurrence of in harbour seals from photo-identification data females pups Orkney (Scotland) during pupping seasons between 2016 2019. We used a generalised linear model framework investigate effect on duration lactation (females) nursin...

Adoption of nongenetic offspring occurs in a variety of species but is rare in equids. We report a case of adoption by a free-ranging, feral mare Equus caballus and compare the maternal care received by her genetic offspring (born 1995) to that of her adopted offspring (born 1996) for the first 30 weeks of development. We compare five measures of care: (1) total time spent suckling, (2) mare ag...