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קהילה:
אסיף מאגר המחקר החקלאי
פותח על ידי קלירמאש פתרונות בע"מ -
Early mammary gland metabolic and immune responses during natural-like and forceful drying-off in high-yielding dairy cows
Year:
2013
Source of publication :
Journal of Dairy Science
Authors :
מרין, עוזי
;
.
סילניקוב, ניסים
;
.
שפירו, פירה
;
.
Volume :
96
Co-Authors:
Silanikove, N., Biology of Lactation Laboratory, Institute of Animal Science, ARO, the Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Merin, U., Department of Food Quality and Safety, Postharvest and Food Sciences, ARO, the Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Shapiro, F., Biology of Lactation Laboratory, Institute of Animal Science, ARO, the Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Leitner, G., National Mastitis Center, Kimron Veterinary Institute, PO Box 12, Bet Dagan 50250, Israel
Facilitators :
From page:
6400
To page:
6411
(
Total pages:
12
)
Abstract:
The present work compared metabolic and immune responses in genetically high-producing cows that produced a low amount of milk before expected involution and in cows with the same genetic potential that produced copious amounts of milk before their scheduled drying-off. Ten multiparous lactating Israeli Holstein cows producing approximately 10,500. L in the current lactation, without bacterial infection and scheduled for drying-off approximately 60. d before their expected parturition, were studied. Five of the cows that exhibited a sharp, spontaneous reduction in milk yield at the end of their lactation and produced less than ~14. L/d were defined as cows approaching natural involution (ANI), and 5 cows that produced between 25 and 35. L/d were defined as cows approaching forced involution (AFI). Three days before scheduled drying-off, milking was stopped and milk samples were collected from each quarter. After milking cessation, only modest swelling was observed in the udders of the ANI cows. In the ANI cows, lactose and fat concentrations decreased and the fat:lactose concentration ratio indicated that on d 1 and 2 fat concentrations decreased faster than lactose concentration, whereas on d 3, the rate of reduction was about the same for lactose and fat. In contrast, in AFI cows, fat concentrations increased on d 1 and the fat:lactose ratio indicated that changes in fat secretion were minor compared with those of lactose secretion. Rennet clotting time of milk after drying-off in the ANI cows increased, whereas curd firmness decreased rapidly, such that mammary secretions did not coagulate on d 3. In the AFI cows, such significant changes were observed only on d 3. The inflammatory response increased in both groups, but at each stage the increase was greater in ANI cows than in AFI cows. On d 1, the increase in leukocyte numbers in the ANI cows was made up of mononuclear cells (i.e., T lymphocytes and macrophages). In contrast, in the AFI cows, we observed a marked increase in leukocyte numbers, mainly in the form of polymorphonuclear cells. Our data indicate that the abrupt mammary involution induced in AFI cows provoked signs of distress, which were associated with neutrophilia in milk. In contrast, in the ANI cows, cessation of milking occurred without evidence of engorgement of the udder. Physiological differences in ANI and AFI cows are distinct and are reflected in the differences in the leukocyte populations in milk. © 2013 American Dairy Science Association.
Note:
Related Files :
Animal
Animals
cattle
chemistry
Female
Involution
lactation
Mammary gland
metabolism
milk
secretion (process)
עוד תגיות
תוכן קשור
More details
DOI :
10.3168/jds.2013-6740
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
20563
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:37
You may also be interested in
Scientific Publication
Early mammary gland metabolic and immune responses during natural-like and forceful drying-off in high-yielding dairy cows
96
Silanikove, N., Biology of Lactation Laboratory, Institute of Animal Science, ARO, the Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Merin, U., Department of Food Quality and Safety, Postharvest and Food Sciences, ARO, the Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Shapiro, F., Biology of Lactation Laboratory, Institute of Animal Science, ARO, the Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Leitner, G., National Mastitis Center, Kimron Veterinary Institute, PO Box 12, Bet Dagan 50250, Israel
Early mammary gland metabolic and immune responses during natural-like and forceful drying-off in high-yielding dairy cows
The present work compared metabolic and immune responses in genetically high-producing cows that produced a low amount of milk before expected involution and in cows with the same genetic potential that produced copious amounts of milk before their scheduled drying-off. Ten multiparous lactating Israeli Holstein cows producing approximately 10,500. L in the current lactation, without bacterial infection and scheduled for drying-off approximately 60. d before their expected parturition, were studied. Five of the cows that exhibited a sharp, spontaneous reduction in milk yield at the end of their lactation and produced less than ~14. L/d were defined as cows approaching natural involution (ANI), and 5 cows that produced between 25 and 35. L/d were defined as cows approaching forced involution (AFI). Three days before scheduled drying-off, milking was stopped and milk samples were collected from each quarter. After milking cessation, only modest swelling was observed in the udders of the ANI cows. In the ANI cows, lactose and fat concentrations decreased and the fat:lactose concentration ratio indicated that on d 1 and 2 fat concentrations decreased faster than lactose concentration, whereas on d 3, the rate of reduction was about the same for lactose and fat. In contrast, in AFI cows, fat concentrations increased on d 1 and the fat:lactose ratio indicated that changes in fat secretion were minor compared with those of lactose secretion. Rennet clotting time of milk after drying-off in the ANI cows increased, whereas curd firmness decreased rapidly, such that mammary secretions did not coagulate on d 3. In the AFI cows, such significant changes were observed only on d 3. The inflammatory response increased in both groups, but at each stage the increase was greater in ANI cows than in AFI cows. On d 1, the increase in leukocyte numbers in the ANI cows was made up of mononuclear cells (i.e., T lymphocytes and macrophages). In contrast, in the AFI cows, we observed a marked increase in leukocyte numbers, mainly in the form of polymorphonuclear cells. Our data indicate that the abrupt mammary involution induced in AFI cows provoked signs of distress, which were associated with neutrophilia in milk. In contrast, in the ANI cows, cessation of milking occurred without evidence of engorgement of the udder. Physiological differences in ANI and AFI cows are distinct and are reflected in the differences in the leukocyte populations in milk. © 2013 American Dairy Science Association.
Scientific Publication
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