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Exogenous bovine somatotropin and mist-fan cooling synergistically promote the intramammary glucose transport for lactose synthesis in crossbred Holstein cows in the tropics
- Source :
- Veterinary World, Veterinary World, Vol 14, Iss 5, Pp 1247-1257 (2021)
- Publication Year :
- 2021
- Publisher :
- Veterinary World, 2021.
-
Abstract
- Background and Aim: Milk synthesis by the mammary gland is negatively influenced in part by high ambient temperature (AT). This study aimed to clarify the pathway of intramammary glucose utilization involved in mediating lactose synthesis during treatment with somatotropin under housing with misters and fans. Materials and Methods: A single subcutaneous injection of 500 mg of recombinant bovine somatotropin (rbST) was administered 3 times once every 14 days to 87.5% crossbred Holstein cattle in early-/mid-/late lactation, under housing in a normal shaded barn and in a shaded barn with a mist-fan cooling system. Results: The milk yields of the cooled cows tended to increase compared with those of uncooled cows and exhibited more potentiated effects in response to rbST treatment, coinciding with increases in mammary plasma flow and glucose uptake, but not in the mammary extraction of glucose. Treatment with rbST in the cooled cows resulted in a greater increase in the milk glucose concentration and a greater decrease in the milk glucose-6-phosphate concentration at all stages of lactation. Conclusion: rbST treatment exerted its galactopoietic action more by local intramammary factors than by other extramammary factors at a low AT and the synergistic effect between rbST treatment and low AT increased the availability of intramammary glucose transport in activating the process of lactose synthesis.
- Subjects :
- Glucose uptake
Veterinary medicine
Mammary gland
SF1-1100
lactose
03 medical and health sciences
Subcutaneous injection
chemistry.chemical_compound
Animal science
mist-fans cooling
crossbred Holstein cattle
Lactation
SF600-1100
medicine
Bovine somatotropin
Lactose
030304 developmental biology
0303 health sciences
General Veterinary
0402 animal and dairy science
Glucose transporter
milk glucose-6-phosphate
recombinant bovine somatotropin
04 agricultural and veterinary sciences
040201 dairy & animal science
Animal culture
medicine.anatomical_structure
chemistry
milk glucose
Barn (unit)
Research Article
Subjects
Details
- Language :
- English
- ISSN :
- 22310916 and 09728988
- Volume :
- 14
- Issue :
- 5
- Database :
- OpenAIRE
- Journal :
- Veterinary World
- Accession number :
- edsair.doi.dedup.....7890fbe857c9cf2b6dbf3c02963cbf73