Teat stimulation-induced release of prolactin and basal concentrations of prolactin and growth hormone in pregnant dairy and beef heifers

Cowie, 1980, Growth and development of the mammary gland, 58 Erb, 1977, Hormonal control of mammogenesis and onset of lactation in cows—A review, J Dairy Sci, 60, 155, 10.3168/jds.S0022-0302(77)83849-6 Forsyth, 1983, The endocrinology of lactation Tucker, 1979, Endocrinology of lactation, Sem Perinatol, 3, 199 Tucker, 1981, Physiological control of mammary growth, lactogenesis and lactation, J Dairy Sci, 64, 1403, 10.3168/jds.S0022-0302(81)82711-7 Koprowski, 1971, Failure of oxytocin to initiate prolactin or luteinizing hormone release in lactating dairy cows, J Dairy Sci, 54, 1675, 10.3168/jds.S0022-0302(71)86088-5 SAS Institute Inc., 1987, Version 6 Edition Hart, 1979, Endocrine control of energy metabolism in the cow: Correlations of hormones and metabolites in high and low yielding cows for stages of lactation, J Dairy Sci, 62, 270, 10.3168/jds.S0022-0302(79)83235-X Hart, 1978, Endocrine control of energy metabolism in the cow: Comparison of the levels of hormones (prolactin, growth hormone, insulin and thyroxine) and metabolites in the plasma of high- and low-yielding cattle at various stages of lactation, J Endocr, 77, 333, 10.1677/joe.0.0770333 Hart, 1983, Endocrine control of nutrient partition in lactating ruminants, 42, 181 Barnes, 1985, Influence of selection for milk yield on endogenous hormones and metabolites in Holstein heifers and cows, J Anim Sci, 60, 271, 10.2527/jas1985.601271x Koprowski, 1973, Serum prolactin during various physiological states and its relationship to milk production in the bovine, Endocrinology, 92, 1480, 10.1210/endo-92-5-1480 Kazmer, 1986, Effect of genetic selection for milk yield and increased milking frequency on plasma growth hormone and prolactin concentration in Holstein cows, J Anim Sci, 63, 1220, 10.2527/jas1986.6341220x Leining, 1976, Prolactin and growth hormone in calves selected for milk yield, J Anim Sci, 43, 293 Akers, 1983, Teat stimulation-induced prolactin release in non-pregnant and pregnant Holstein heifers, J Endocrinol, 96, 433, 10.1677/joe.0.0960433 Akers, 1981, Prolactin regulation of milk secretion and biochemical differentiation of mammary epithelial cells in periparturient cows, Endocrinology, 109, 23, 10.1210/endo-109-1-23 Hart, 1977, An analysis of specific stimuli causing the release of prolactin and growth hormone at milking in the goat, J Endocrinol, 72, 163, 10.1677/joe.0.0720163 Reinhardt, 1974, Analysis of teat stimulation as specific stimulus for prolactin in cattle, Neuroendocrinol, 14, 289, 10.1159/000122272 Reinhardt, 1975, Prolactin release in dairy heifers relative to duration of teat stimulation, Neuroendocrinol, 17, 54, 10.1159/000122341 Chew, 1979, Variables associated with peripartum traits in dairy cows, 62, 1394 Thatcher, 1974, Effects of season, climate and temperature on reproduction and lactation, J Dairy Sci, 57, 360, 10.3168/jds.S0022-0302(74)84894-0 Wetteman, 1976, The influence of low and elevated ambient temperatures on serum prolactin and growth hormone in heifers, Int J Biometeor, 20, 36, 10.1007/BF01553169 Peters, 1978, Prolactin and growth hormone responses to photoperiod in heifers, Endocrinology, 103, 229, 10.1210/endo-103-1-229 Schams, 1972, Prolactin levels in bovine blood, influenced by milking manipulation, genital stimulation and oxytocin administration with specific consideration of the seasonal variations, Acta Endocrinol, 71, 684, 10.1530/acta.0.0710684 Tucker, 1974, Serum prolactin and growth hormone in Holstein bulls, J Dairy Sci, 57, 1092, 10.3168/jds.S0022-0302(74)85015-0 Tucker, 1976, Effects of ambient temperature and relative humidity on serum prolactin and growth hormone in heifers, 151, 623 Peters, 1981, Milk yield, feed intake, prolactin growth hormone and glucocorticoid response of cows to supplemented light, J Dairy Sci, 64, 1671, 10.3168/jds.S0022-0302(81)82745-2 Ingalls, 1973, Bovine serum LH, GH and prolactin during late pregnancy, parturition and early lactation, 43, 161 Oxender, 1972, Serum growth hormone, LH and prolactin in the pregnant cow, J Anim Sci, 35, 51, 10.2527/jas1972.35151x