Changes of plasma insulin, urea, amino acids and rumen metabolites in somatotropin treated dairy cows

Cheli, F.; Baldi, Alfonso; Gregoretti, Lucilla; Rosi, F.; Cattaneo, D.; Dell’Orto, V.

doi:10.1007/bf01318858

Cited by 4 publications

(3 citation statements)

References 24 publications

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“…Since the feed intake effect in long term ST supplementation appears to be a secondary effect due to the physiological adjustment to meet the energy and nutrient requirements for higher milk synthesis, short term ST supplementation that decreases feed intake appears to be the primary ST effect. In addition, a lack of change in nutrient digestibility, in consistent with earlier reports (Cheli et al, 1998;Santos et al, 1999;Chanchai et al, 2010), suggest that rbST has negligible effect on the pre-adsorptive stage and that decreased in feed intake in the present experiment came mainly from the rbST effect of post-absorptive stage or the whole body metabolism.…”

Section: Discussionsupporting

confidence: 92%

Somatotropin supplementation decreases feed intake in crossbred dairy goats during the early phase of lactation

Thammacharoen

Nguyen

Suthikai

et al. 2014

Small Ruminant Research

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Section: Discussionsupporting

confidence: 92%

Somatotropin supplementation decreases feed intake in crossbred dairy goats during the early phase of lactation

Thammacharoen

Nguyen

Suthikai

et al. 2014

Small Ruminant Research

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“…An increase in mammary blood flow during rbST supplementation (Chaiyabutr et al. 2000) may increase mammary uptake of plasma urea which would contribute to an increase in MUN and a decrease in plasma urea levels as reported by Cheli et al. (1998) in exotic dairy cows.…”

Section: Discussionmentioning

confidence: 95%

“…These factors can affect the physiological signals received by the mammary gland in the forms of nutrients and hormones from blood to sustain milk synthesis. Somatotropin is one hormone (amongst many) which is known to play a role of the interaction between genetic potential and nutrition and milk production (Cheli et al. 1998; Gulay & Hatipoglu 2005; Settivari et al.…”

Section: Introductionmentioning

confidence: 99%

Effects of misty‐fan cooling and supplemental rbST on rumen function and milk production of crossbred Holstein cattle during early, mid and late lactation in a tropical environment

Chanchai¹,

Chanpongsang²,

Chaiyabutr³

2010

Animal Science Journal

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Two groups of five crossbred 87.5% Holstein cattle were housed in normal shade only (NS) as non-cooled cows and in shaded housing with misty-fan cooling (MF) as cooled cows. The cows were treated with recombinant bovine somatotropin (rbST) in early, mid and late lactation with three consecutive injections of rbST in every 14 days. Ambient temperatures and the temperature humidity index in the NS barn were significantly higher than those of the MF barn, whereas relative humidity in MF was higher than that of NS barn. The DMI of cooled cows were higher than those of non-cooled cows, and cooled cows exhibited more response to rbST treatment. Exogenous rbST significantly increased milk yield throughout lactation. The rbST-treated cows had higher total ruminal fermentation products as volatile fatty acid and ammonia nitrogen than the non-rbST treated cows and associated changes were greater in cooled animals in all stages of lactation. Exogenous rbST increased the concentrations of milk urea nitrogen in both groups. These results suggest that the changes in ruminal fermentation with greater production of total VFA and NH(3)N in response to rbST in crossbred cows whether under misty-fan cooling or not, is in part through an increase in feed intake, thereby making more substrate available to the mammary gland for milk synthesis.

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Effects of growth hormone-releasing hormone treatment on milk production and plasma hormones and metabolites in lactating Japanese Black cows under negative energy balance1

Shingu¹,

Hodate²,

Kushibiki³

et al. 2009

Journal of Animal Science

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The current study was performed to clarify the effects of GHRH treatment on milk production and plasma hormones and metabolites in lactating Japanese Black cows (a beef breed) under negative energy balance (EB). Ten multiparous lactating beef cows were offered a normal-energy diet daily (110% of ME requirements for maintenance and lactation) until 5 d in milk (DIM) to standardize the cows before dietary treatment. From 6 DIM to the final days (63 DIM) of the experiment, the cows were allotted to experimental dietary treatments: 5 cows were offered a diet formulated for 130% [high-energy diet (HED)] and the remaining 5 cows were offered a diet formulated for 80% [low-energy diet (LED)] of ME requirements for maintenance and lactation. In addition, all cows received daily subcutaneous injections of 3 mg of bovine GHRH from 36 to 56 DIM (GHRH treatment period). Differences in BW of HED- and LED-fed cows at 63 DIM were +28.4 and -7.2 kg compared with BW at 6 DIM, and HED- and LED-fed cows were under positive EB (+23.7 MJ/d) and negative EB (-11.6 MJ/d) throughout the experiment period. Treatment with GHRH increased (P<0.01) the average daily milk yield to 6.2 kg in HED-fed cows compared with a milk yield of 5.3 kg for 7 d before the GHRH treatment period (pretreatment period); LED-fed cows had no increase in milk production from GHRH treatment. Plasma GH, IGF-1, insulin, and glucose concentrations increased (P<0.05) after GHRH treatment in both HED- and LED-fed cows; GHRH treatment also induced an increase (P<0.05) in the net area under the curve of plasma insulin after glucose challenge in both HED- and LED-fed cows. Plasma urea N concentrations were decreased (P<0.05) by GHRH treatment in HED-fed cows, but not in LED-fed cows. Plasma NEFA concentration was unaffected by GHRH treatment in both HED- and LED-fed cows. We conclude that GHRH treatment of lactating Japanese Black cows stimulates endogenous GH and subsequent IGF-1 secretion and might induce an increase in insulin resistance, irrespective of EB; however, compared with lactating dairy cows, both galactopoietic and lipolytic effects of GHRH might be insufficiently exerted under negative EB in lactating beef cows.

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Changes of plasma insulin, urea, amino acids and rumen metabolites in somatotropin treated dairy cows

Cited by 4 publications

References 24 publications

Somatotropin supplementation decreases feed intake in crossbred dairy goats during the early phase of lactation

Somatotropin supplementation decreases feed intake in crossbred dairy goats during the early phase of lactation

Effects of misty‐fan cooling and supplemental rbST on rumen function and milk production of crossbred Holstein cattle during early, mid and late lactation in a tropical environment

Effects of growth hormone-releasing hormone treatment on milk production and plasma hormones and metabolites in lactating Japanese Black cows under negative energy balance1

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