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פותח על ידי קלירמאש פתרונות בע"מ -
Effect of climatic conditions on peripheral concentrations of LH, progesterone and oestradiol-17β in high milk-yielding cows
Year:
1982
Authors :
הרץ, זאב
;
.
פולמן, ישעיהו
;
.
קאים, משה
;
.
Volume :
66
Co-Authors:
Rosenberg, M., Inst. Anim. Sci., ARO, Volcani Cent., Bet Dagan 50250, Israel
Folman, Y., Inst. Anim. Sci., ARO, Volcani Cent., Bet Dagan 50250, Israel
Herz, Z., Inst. Anim. Sci., ARO, Volcani Cent., Bet Dagan 50250, Israel
Flamenbaum, I.
Berman, A.
Kaim, M.
Facilitators :
From page:
139
To page:
146
(
Total pages:
8
)
Abstract:
In a subtropical climate, high milk-yielding dairy cows were kept during the summer under ventilated conditions or untreated; during the winter, cows were kept untreated. The afternoon mean rectal temperature for multiparous cows in the three groups was 39.3, 39.8 and 38.9°C, respectively. Each group was significantly different from the other two (P<0.05). Plasma LH concentrations measured every 6 h during the oestrous period in 38 'summer' cows were not significantly different for untreated and ventilated animals. Conception rate was higher (P<0.05) in cows that showed oestrous behaviour before the LH surge reached its peak than in cows in which oestrus coincided with or occurred later than the LH surge. Plasma progesterone level measured in 62 cows during the oestrous cycle before the first insemination were higher in the winter than in the summer in multiparous, but not in primiparous, cows. Ventilation increased progesterone levels in multiparous and primiparous cows. Plasma oestradiol-17β levels did not differ between groups until 36 h before the onset of oestrus, when they remained at 4.75 pg/ml in winter and summer-ventilated cows but increased to 6.75 pg/ml in summer untreated cows (P<0.01). Significant negative correlations were found between oestradiol levels observed 12 h before to 12 h after the onset of oestrus and plasma progesterone concentration during both the preceding and the subsequent oestrous cycles.
Note:
Related Files :
animal experiment
Animals
body temperature
cattle
Female
female genital system
lactation
pregnancy
עוד תגיות
תוכן קשור
More details
DOI :
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
24732
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:09
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Scientific Publication
Effect of climatic conditions on peripheral concentrations of LH, progesterone and oestradiol-17β in high milk-yielding cows
66
Rosenberg, M., Inst. Anim. Sci., ARO, Volcani Cent., Bet Dagan 50250, Israel
Folman, Y., Inst. Anim. Sci., ARO, Volcani Cent., Bet Dagan 50250, Israel
Herz, Z., Inst. Anim. Sci., ARO, Volcani Cent., Bet Dagan 50250, Israel
Flamenbaum, I.
Berman, A.
Kaim, M.
Effect of climatic conditions on peripheral concentrations of LH, progesterone and oestradiol-17β in high milk-yielding cows
In a subtropical climate, high milk-yielding dairy cows were kept during the summer under ventilated conditions or untreated; during the winter, cows were kept untreated. The afternoon mean rectal temperature for multiparous cows in the three groups was 39.3, 39.8 and 38.9°C, respectively. Each group was significantly different from the other two (P<0.05). Plasma LH concentrations measured every 6 h during the oestrous period in 38 'summer' cows were not significantly different for untreated and ventilated animals. Conception rate was higher (P<0.05) in cows that showed oestrous behaviour before the LH surge reached its peak than in cows in which oestrus coincided with or occurred later than the LH surge. Plasma progesterone level measured in 62 cows during the oestrous cycle before the first insemination were higher in the winter than in the summer in multiparous, but not in primiparous, cows. Ventilation increased progesterone levels in multiparous and primiparous cows. Plasma oestradiol-17β levels did not differ between groups until 36 h before the onset of oestrus, when they remained at 4.75 pg/ml in winter and summer-ventilated cows but increased to 6.75 pg/ml in summer untreated cows (P<0.01). Significant negative correlations were found between oestradiol levels observed 12 h before to 12 h after the onset of oestrus and plasma progesterone concentration during both the preceding and the subsequent oestrous cycles.
Scientific Publication
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