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Silanikove, N., Ruminant Physiology, Institute of Animal Science, Agricultural Research Organization, The Volcani Centre, P.O.B. 6, Bet Dagon, 50250, Israel
Shapiro, F., Ruminant Physiology, Institute of Animal Science, Agricultural Research Organization, The Volcani Centre, P.O.B. 6, Bet Dagon, 50250, Israel
Leitner, G., National Mastitis Reference Centre, Kimron Veterinary Institute, P.O.B. 12, Bet Dagon, 50250, Israel
Merin, U., Dairy Science Laboratory, Institute of Technology and Storage of Agricultural Products, Agricultural Research Organization, The Volcani Centre, P.O.B. 6, Bet Dagan, 50250, Israel
The present report focuses on how the differences in the plasmin (PL) system between sheep and goats are reflected in their response to subclinical intramammary infection (IMI), particularly in respect to casein (CN) degradation and milk yield (MY). Plasmin is the major proteolytic enzyme in milk, where it is found mostly in its inactive zymogen-plasminogen (PLG), which is activated by plasmin activator (PA). Both plasmin activator (PA) and PL activities in goats in late lactation and goats with subclinical IMI are negatively correlated with MY and the coagulating properties of milk, suggesting that this system is important in goats as well. The higher CN content along with higher PL activity in sheep compared with goats resulted in higher CN degradation products that include factors that down-regulate milk secretion, which explains the more acute response in MY. Sheep are more vulnerable than goats to sub-clinical infections in terms of MY. © South African Society for Animal Science.
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Interrelationships between the activities of the plasmin system in goats and sheep experiencing subclinical mastitis, casein degradation and milk yield
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Silanikove, N., Ruminant Physiology, Institute of Animal Science, Agricultural Research Organization, The Volcani Centre, P.O.B. 6, Bet Dagon, 50250, Israel
Shapiro, F., Ruminant Physiology, Institute of Animal Science, Agricultural Research Organization, The Volcani Centre, P.O.B. 6, Bet Dagon, 50250, Israel
Leitner, G., National Mastitis Reference Centre, Kimron Veterinary Institute, P.O.B. 12, Bet Dagon, 50250, Israel
Merin, U., Dairy Science Laboratory, Institute of Technology and Storage of Agricultural Products, Agricultural Research Organization, The Volcani Centre, P.O.B. 6, Bet Dagan, 50250, Israel
Interrelationships between the activities of the plasmin system in goats and sheep experiencing subclinical mastitis, casein degradation and milk yield
The present report focuses on how the differences in the plasmin (PL) system between sheep and goats are reflected in their response to subclinical intramammary infection (IMI), particularly in respect to casein (CN) degradation and milk yield (MY). Plasmin is the major proteolytic enzyme in milk, where it is found mostly in its inactive zymogen-plasminogen (PLG), which is activated by plasmin activator (PA). Both plasmin activator (PA) and PL activities in goats in late lactation and goats with subclinical IMI are negatively correlated with MY and the coagulating properties of milk, suggesting that this system is important in goats as well. The higher CN content along with higher PL activity in sheep compared with goats resulted in higher CN degradation products that include factors that down-regulate milk secretion, which explains the more acute response in MY. Sheep are more vulnerable than goats to sub-clinical infections in terms of MY. © South African Society for Animal Science.
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