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Effect of photoperiod in the third trimester of gestation on milk production and circulating hormones in dairy goats
Year:
2007
Source of publication :
Journal of Dairy Science
Authors :
Mabjeesh, Sameer Jermaya
;
.
Shamay, Avi
;
.
Volume :
90
Co-Authors:
Mabjeesh, S.J., Department of Animal Sciences, Faculty of Agricultural, Food and Environmental Quality Sciences, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Gal-Garber, O., Department of Animal Sciences, Faculty of Agricultural, Food and Environmental Quality Sciences, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Shamay, A., Agricultural Research Organization, Volcani Center, Institute of Animal Science, Bet Dagan 50250, Israel
Facilitators :
From page:
699
To page:
705
(
Total pages:
7
)
Abstract:
Multiparous Israeli Saanen goats (n = 8) were blocked at dry off (approximately 45 d prepartum) into 2 treatments of 4 goats each based on body weight (BW), previous milk production, and the number of detected embryos in utero. Treatments consisted of long-day (16 h light:8 h dark) and short-day (8 h light: 16 h dark) photoperiods at normothermic ambient temperature (22°C, 72% relative humidity). All goats were returned to ambient photoperiod after kidding, milked twice daily, and milk yield was automatically recorded. Dry matter intake was similar between treatments and averaged 980 g/d. Milk production was greater in the short-day than in the long-day treatment (2,932 vs. 2,320 g/d) during the 12-wk experimental period. Milk protein and lactose contents were similar in both treatments and averaged 3.61 and 4.88%, respectively, whereas milk fat was greater in the long-day treatment (4.80 vs. 4.22%). Plasma insulin-like growth factor 1 was greater in the long-day treatment (149 vs. 73 ng/ mL) during the dry period than in the short-day treatment, but was similar postkidding, averaging 76 ng/ mL. Concentrations of triiodothyronine in plasma were similar in both treatments during the dry period, but greater during lactation in the short-day treatment (122.1 vs. 94.1 ng/mL). Plasma prolactin was greater in the long-day than in the short-day treatment during the dry period (28.0 vs. 17.5 ng/mL), whereas it was similar throughout lactation (11.7 ng/mL). These data support the idea that greater milk production in goats exposed to short days during the dry period is not explained by differences in feed intake or increased secretion of insulin-like growth factor 1. © American Dairy Science Association, 2007.
Note:
Related Files :
Animal
Animals
Blood
Female
goats
hormones
Insulin-Like Growth Factor I
lactation
Lipids
milk
pH
pregnancy
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Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
31064
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:59
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Scientific Publication
Effect of photoperiod in the third trimester of gestation on milk production and circulating hormones in dairy goats
90
Mabjeesh, S.J., Department of Animal Sciences, Faculty of Agricultural, Food and Environmental Quality Sciences, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Gal-Garber, O., Department of Animal Sciences, Faculty of Agricultural, Food and Environmental Quality Sciences, Hebrew University of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Shamay, A., Agricultural Research Organization, Volcani Center, Institute of Animal Science, Bet Dagan 50250, Israel
Effect of photoperiod in the third trimester of gestation on milk production and circulating hormones in dairy goats
Multiparous Israeli Saanen goats (n = 8) were blocked at dry off (approximately 45 d prepartum) into 2 treatments of 4 goats each based on body weight (BW), previous milk production, and the number of detected embryos in utero. Treatments consisted of long-day (16 h light:8 h dark) and short-day (8 h light: 16 h dark) photoperiods at normothermic ambient temperature (22°C, 72% relative humidity). All goats were returned to ambient photoperiod after kidding, milked twice daily, and milk yield was automatically recorded. Dry matter intake was similar between treatments and averaged 980 g/d. Milk production was greater in the short-day than in the long-day treatment (2,932 vs. 2,320 g/d) during the 12-wk experimental period. Milk protein and lactose contents were similar in both treatments and averaged 3.61 and 4.88%, respectively, whereas milk fat was greater in the long-day treatment (4.80 vs. 4.22%). Plasma insulin-like growth factor 1 was greater in the long-day treatment (149 vs. 73 ng/ mL) during the dry period than in the short-day treatment, but was similar postkidding, averaging 76 ng/ mL. Concentrations of triiodothyronine in plasma were similar in both treatments during the dry period, but greater during lactation in the short-day treatment (122.1 vs. 94.1 ng/mL). Plasma prolactin was greater in the long-day than in the short-day treatment during the dry period (28.0 vs. 17.5 ng/mL), whereas it was similar throughout lactation (11.7 ng/mL). These data support the idea that greater milk production in goats exposed to short days during the dry period is not explained by differences in feed intake or increased secretion of insulin-like growth factor 1. © American Dairy Science Association, 2007.
Scientific Publication
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