Effect of exogenous prolactin administration on lactational performance of dairy cows

Plaut, Karen; Bauman, Dale E.; Agergaard, N.; Akers, R.M.

doi:10.1016/0739-7240(87)90024-5

Cited by 86 publications

(49 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the same way, other studies have demonstrated that machine milking continues influencing PRL levels several minutes after the end of milking [14,28,29]. Yet PRL is apparently not essential for galactopoiese in ruminants [33]. Recently, PRL administration in dairy goats has been found to significantly influence milk yield [16].…”

Section: Effect Of Suckling On Hormone Release In Milked Cowsmentioning

confidence: 77%

Effect of calf suckling on oxytocin, prolactin, growth hormone and milk yield in crossbred Gir $\times$ Holstein cows during milking

Negrão

Marnet

2002

Reprod. Nutr. Dev.

View full text Add to dashboard Cite

International audienceThis study evaluated the effect of different milking managements on oxytocin, prolactin and growth hormone release in Gir $\times$ Holstein cows. Six cows were suckled by their calves, before and after milking (SM group); another six cows were submitted to exclusive milking (M group). High OT levels were observed during suckling of the SM group, however both groups had similar levels of OT during milking. The SM group presented PRL levels significantly higher than the M group, however only during suckling. For GH levels, the SM group showed higher levels than the M group, however this difference was significant only during the first suckling, cleaning of the teats and at the beginning of machine milking. Despite these results, SM cows produced more milk (milking plus suckling) than M cows, however milk obtained by milking was similar for both groups

show abstract

Section: Effect Of Suckling On Hormone Release In Milked Cowsmentioning

confidence: 77%

Effect of calf suckling on oxytocin, prolactin, growth hormone and milk yield in crossbred Gir $\times$ Holstein cows during milking

Negrão

Marnet

2002

Reprod. Nutr. Dev.

View full text Add to dashboard Cite

show abstract

“…Une tendance à la lipomobilisation a toutefois été observée dans certaines expériences de longue durée (Soderholm et al, 1986a, b Emery, 1973 ;Convey, 1974 ;Patterson et Linzell, 1974 ;Bauman, 1976 ;Swan, 1976 ;Coggins et Field, 1978 ;Hart et al, 1978Hart et al, , 1979Miller et al, 1978 ;Cowie et al, 1980 ;Walsh et al, 1980 ;Trenkle, 1981 ;Blum et al, 1982Blum et al, , 1983Blum, 1983, Mc Dowell, 1983Bitman et al, 1984b ;Collier et al, 1984 ;Refsal et al, 1984 ;Aceves et al, 1985 ;Akasha et al, 1985 ;Frohli et Pethes et al, 1985 ;Plaut et al, 1985 ;Thilsted, 1985b ;Bauman et Mc Cutcheon, 1986 ;Gerloff et al, 1986bJ. Les réponses de la sécrétion d'hormone de croissance à la sous-alimentation (revue de Vernon, 1980) ou à la gestation (Koprowski et Tucker, 1973) (Collier et al, 1984). La mobilisation des protéines corporelles (revue de Chilliard et al, 1983) Van den Bergh, 1972 ;Metz et al, 1974 (Little, 1974 ;Rowlands, 1978 ;Treacher, 1978 ;Larnicol et al, 1984).…”

Section: Préambuleunclassified

Revue bibliographique : Variations quantitatives et métabolisme des lipides dans les tissus adipeux et le foie au cours du cycle gestation-lactation 2e partie : chez la brebis et la vache

Chilliard¹

1987

Reprod. Nutr. Dévelop.

View full text Add to dashboard Cite

(cf. I.N.R.A., 1978) Par rapport à la ratte, qui a fait l'objet de la première partie de cette revue bibliographique (Chilliard, 1986), les ruminants présentent des particularités digestives qui conditionnent largement, par la nature des nutriments absorbés, l'orientation de leur métabolisme. En effet, les aliments qu'ils ingèrent, riches en parois végétales, séjournent pendant 15 à 48 h dans le rumen-réseau (dont le contenu est de 60 à 100 I chez le bovin adulte), où ils subissent une dégradation plus ou moins complète sous l'action des enzymes sécrétées par les micro-organismes qui y pullulent (10 10 par ml).Les (Basset, 1975). Le métabolisme des lipides dans le foie de ruminant a été décrit par Rémésy et al. (1984, 1986 Ballard, 1967Ballard et al., 1969Ballard et al., , 1972Hood et a/., 1972 ; Ingle et al., 1972a, b ;Vézinhet, 1976 ;Liepa et al., 1978 ;Prior, 1978 ;Smith et Crouse, 1984

show abstract

“…The increased prolactin concentrations are believed to account in part for the increased mammary parenchymal weight in prepubertal and postpubertal heifers exposed to LDPP compared to heifers exposed to SDPP, and these effects carried through to production, as heifers exposed to LDPP produced more milk during their first lactation than SDPP (Petitclerc et al, 1985;Rius and Dahl, 2006). However, and importantly, when prolactin was administered exogenously to dairy cows there was no effect on their milk production (Plaut et al, 1987) suggesting that other mechanisms are stimulating the increase in milk yield in lactating cows exposed to LDPP. Slow-release melatonin implants Plaut and Casey 398 administered during LDPP for 12 weeks decreased plasma prolactin levels and reduced milk yield by 23%.…”

mentioning

confidence: 99%

Does the circadian system regulate lactation?

Plaut

Casey

2012

Animal

Self Cite

View full text Add to dashboard Cite

Environmental variables such as photoperiod, heat, stress, nutrition and other external factors have profound effects on quality and quantity of a dairy cow's milk. The way in which the environment interacts with genotype to impact milk production is unknown; however, evidence from our laboratory suggests that circadian clocks play a role. Daily and seasonal endocrine rhythms are coordinated in mammals by the master circadian clock in the hypothalamus. Peripheral clocks are distributed in every organ and coordinated by signals from the master clock. We and others have shown that there is a circadian clock in the mammary gland. Approximately 7% of the genes expressed during lactation had circadian patterns including core clock and metabolic genes. Amplitude changes occurred in the core mammary clock genes during the transition from pregnancy to lactation and were coordinated with changes in molecular clocks among multiple tissues. In vitro studies using a bovine mammary cell line showed that external stimulation synchronized mammary clocks, and expression of the core clock gene, BMAL1, was induced by lactogens. Female clock/ clock mutant mice, which have disrupted circadian rhythms, have impaired mammary development and their offspring failed to thrive suggesting that the dam's milk production was not adequate enough to nourish their young. We envision that, in mammals, during the transition from pregnancy to lactation the master clock is modified by environmental and physiological cues that it receives, including photoperiod length. In turn, the master clock coordinates changes in endocrine milieu that signals peripheral tissues. In dairy cows, it is clear that changes in photoperiod during the dry period and/or during lactation influences milk production. We believe that the photoperiod effect on milk production is mediated, in part by the 'setting' of the master clock with light, which modifies peripheral circadian clocks including the mammary core clock and subsequently impacts milk yield and may impact milk composition.Keywords: mammary, lactation, circadian rhythm, photoperiod, metabolism ImplicationsThe circadian system coordinates internal physiological processes in mammals and synchronizes these processes to the animal's environment. We review the literature and discuss recent findings from our laboratory and others that suggest the circadian system regulates lactation, including coordinating changes in the dam's physiology needed to initiate and maintain lactation and mediating the photoperiod effect on milk production. Identification of environmental and physiological inputs that affect genes that control circadian rhythms will enable development of approaches to alter gene expression to maximize production efficiency in farm animals. IntroductionNearly all physiological and behavioral functions of animals are rhythmic including secretion patterns of hormones, sleep-wake cycle, metabolism and core body temperature.A circadian rhythm is a roughly 24-h cycle in the biochemical, physiological or behaviora...

show abstract

Effect of exogenous prolactin administration on lactational performance of dairy cows

Cited by 86 publications

References 30 publications

Effect of calf suckling on oxytocin, prolactin, growth hormone and milk yield in crossbred Gir $\times$ Holstein cows during milking

Effect of calf suckling on oxytocin, prolactin, growth hormone and milk yield in crossbred Gir $\times$ Holstein cows during milking

Revue bibliographique : Variations quantitatives et métabolisme des lipides dans les tissus adipeux et le foie au cours du cycle gestation-lactation 2e partie : chez la brebis et la vache

Does the circadian system regulate lactation?

Contact Info

Product

Resources

About