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Nutritional status, suckling behavior, and prolactin release during lactation. 1993

K J Schulze, and K M Rasmussen
Division of Nutritional Sciences, Cornell University, Ithaca, NY 14853.

This experiment was conducted to determine whether suckling-induced prolactin (PRL) values in chronically food-restricted lactating rats resulted from the inability of their litters to suckle vigorously. Rats were randomly assigned to be fed ad lib (AL) or to be chronically restricted (CR) to 50% of AL before and during pregnancy and lactation. Rats nursed their own litter (own) or a litter of the opposite dietary treatment group (other) for 90-min periods at early or peak lactation. Blood was collected regularly through a catheter implanted several days earlier. Suckling contributed to differences in PRL between AL and CR dams in early lactation as demonstrated by an interaction between dietary treatment and type of litter. However, tests of AL own vs. AL other and CR own vs. CR other were not significant. This is probably because the inattentive behavior of CR dams attenuated the PRL response in this group. At peak lactation, PRL values were related to recovery time from catheter implantation; therefore, determinants of PRL release change over the course of lactation.

UI MeSH Term Description Entries
D007774 Lactation The processes of milk secretion by the maternal MAMMARY GLANDS after PARTURITION. The proliferation of the mammary glandular tissue, milk synthesis, and milk expulsion or let down are regulated by the interactions of several hormones including ESTRADIOL; PROGESTERONE; PROLACTIN; and OXYTOCIN. Lactation, Prolonged,Milk Secretion,Lactations, Prolonged,Milk Secretions,Prolonged Lactation,Prolonged Lactations
D008425 Maternal Behavior The behavior patterns associated with or characteristic of a mother. Maternal Patterns of Care,Maternal Care Patterns,Behavior, Maternal,Behaviors, Maternal,Care Pattern, Maternal,Care Patterns, Maternal,Maternal Behaviors,Maternal Care Pattern,Pattern, Maternal Care,Patterns, Maternal Care
D011247 Pregnancy The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH. Gestation,Pregnancies
D011388 Prolactin A lactogenic hormone secreted by the adenohypophysis (PITUITARY GLAND, ANTERIOR). It is a polypeptide of approximately 23 kD. Besides its major action on lactation, in some species prolactin exerts effects on reproduction, maternal behavior, fat metabolism, immunomodulation and osmoregulation. Prolactin receptors are present in the mammary gland, hypothalamus, liver, ovary, testis, and prostate. Lactogenic Hormone, Pituitary,Mammotropic Hormone, Pituitary,Mammotropin,PRL (Prolactin),Hormone, Pituitary Lactogenic,Hormone, Pituitary Mammotropic,Pituitary Lactogenic Hormone,Pituitary Mammotropic Hormone
D005260 Female Females
D005508 Food Deprivation The withholding of food in a structured experimental situation. Deprivation, Food,Deprivations, Food,Food Deprivations
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013391 Sucking Behavior Any suction exerted by the mouth; response of the mammalian infant to draw milk from the breast. Includes sucking on inanimate objects. Not to be used for thumb sucking, which is indexed under fingersucking. Behavior, Sucking,Behaviors, Sucking,Sucking Behaviors
D017207 Rats, Sprague-Dawley A strain of albino rat used widely for experimental purposes because of its calmness and ease of handling. It was developed by the Sprague-Dawley Animal Company. Holtzman Rat,Rats, Holtzman,Sprague-Dawley Rat,Rats, Sprague Dawley,Holtzman Rats,Rat, Holtzman,Rat, Sprague-Dawley,Sprague Dawley Rat,Sprague Dawley Rats,Sprague-Dawley Rats
D051381 Rats The common name for the genus Rattus. Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus

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