Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.1/1165
Título: Associations among milk production traits and glycosylated haemoglobin in dairy cattle: importance of lactose synthesis potential
Autor: Shahbazkia, Homayon Reza
Aminlari, Mahmoud
Tavasoli, Atoosa
Mohamadnia, Ahmad Reza
Cravador, A.
Palavras-chave: Glycosylated haemoglobin
Milk production traits
Lactose synthesis
Dairy cattle
Data: 2010
Citação: Shahbazkia, Homayon Reza; Aminlari, Mahmoud; Tavasoli, Atoosa; Mohamadnia, Ahmad Reza; Cravador, Alfredo. Associations among milk production traits and glycosylated haemoglobin in dairy cattle: importance of lactose synthesis potential. Veterinary Research Communications, 34, 1, 1-9, 2010.
Resumo: Abstract Glucose is the major precursor of lactose synthesis in the mammary gland. Lactose the major carbohydrate and osmolyte of milk, controls milk volume and its concentration. Glycosylated haemoglobin (HbG) is a retrospective measure of mean blood glucose level and it is largely unaffected by recent physiological conditions and environmental events. The purposes of this study were to determine the correlations between lactose traits and other milk production traits in dairy cattle and to investigate whether HbG level can be correlated with milk and lactose production traits. Here, HbG percentage, milk and lactose production traits including milk yield, lactose, protein, SNF, total solid and fat percentages and yields were measured in 485 second calved Iranian Holstein cattle. Statistically significant negative correlations were established between HbG and milk yield (r=−0.88), lactose yield (r=−0.83), SNF yield (r=−0.81), protein yield (r=−0.79) and total solid yield (r=−0.74). Positive correlations were established between lactose yield and milk (r=0.96), protein (r=0.81), SNF (r=0.92) and total solid (r=0.79) yields. The negative correlation between HbG and milk and total lactose production is probably related to the higher glucose demands in the lactating mammary gland of more productive cows. The positive correlation between lactose yield and milk, protein, SNF and total solid yield indicates that the level of lactose synthesis influences milk production traits in ways other than merely via its osmolytic action.
Peer review: yes
URI: http://hdl.handle.net/10400.1/1165
ISSN: 0165-7380
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