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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Effect of Ascophyllum nodosum on alleviation of heat stress in dairy cows  [2011]

Pompeu, L.B.; Williams, J.E.; Spiers, D.E.; Weaber, R.L.; et al.

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A study was conducted to evaluate the effect of Tasco (Ascophyllum nodosum; Acadian Seaplants Limited, Dartmouth, Nova Scotia, Canada) on alleviation of heat stress in dairy cows. Thirty-two cows were randomly assigned (randomized complete block design) to 4 treatments: control-1 (C-1); control for period 2 and 0.50% Tasco for period 3 (C-.5T); 0.25% Tasco (0.25T); 0.50% Tasco (0.5T). The study was divided into 3 periods: period 1 (7 d; adaptation to Calan Gate system); period 2 [28 d; C-1 and C-.5T representing the control (CON)]; period 3 (28 d; C-.5T was changed to 0.50% Tasco to evaluate duration of feeding Tasco and other groups remained unchanged). Respiration rate and rump and ear skin temperatures were measured at 0700, 1600, and 1900 h. Core body temperature was recorded every 20 min with telemetric temperature transmitters in the reticulum. Tasco had no effect (P > 0.10) on milk production, but DMI was occasionally less (P < 0.05) for 0.25T cows than for CON cows in period 2. The rump skin temperature of 0.25T cows was reduced (P < 0.05) for some hours in period 2 and for some days in period 3. Linear regression of core body temperature and rump skin temperature versus ambient temperature in period 3 revealed less (P < 0.05) increase for 0.25T than for the control as ambient temperature increased. These results suggest that inclusion of 0.25% Tasco reduced body temperature response to increasing ambient temperature and sustained milk production,
even with reduced DMI. No benefit of 0.50% Tasco was seen when fed for 28 or 56 d. Limited benefits of Tasco were observed in this study.
From the journal
Professional animal scientists
ISSN : 1080-7446

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2017
Volume:
27 (3
Extent:
181-189
All titles:
"Effect of Ascophyllum nodosum on alleviation of heat stress in dairy cows"@eng
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2017
Volume:
27 (3
Extent:
181-189
All titles:
"Effect of Ascophyllum nodosum on alleviation of heat stress in dairy cows"@eng