The effect of sodium chloride supplementation on the milk production of grazing Holstein Friesian cows during summer and autumn in a humid sub-tropical environment

Granzin, BC and Gaughan, JB (2002) The effect of sodium chloride supplementation on the milk production of grazing Holstein Friesian cows during summer and autumn in a humid sub-tropical environment. Animal Feed Science And Technology, 96 3-4: 147-160. doi:10.1016/S0377-8401(01)00322-4


Author Granzin, BC
Gaughan, JB
Title The effect of sodium chloride supplementation on the milk production of grazing Holstein Friesian cows during summer and autumn in a humid sub-tropical environment
Journal name Animal Feed Science And Technology   Check publisher's open access policy
ISSN 0377-8401
Publication date 2002-04-30
Sub-type Article (original research)
DOI 10.1016/S0377-8401(01)00322-4
Open Access Status
Volume 96
Issue 3-4
Start page 147
End page 160
Total pages 14
Editor P.H. Robinson
P. Uden
J. Wiseman
Place of publication Amsterdam
Publisher Elsevier
Collection year 2002
Language eng
Subject C1
300400 Animal Production
630104 Dairy cattle
Abstract Two studies were conducted to examine the effects of including NaCl at various rates in grain-based supplements for Friesian cows grazing established, dominant (>90%), rainfed kikuyu (Pennisetum clandestinum cv. Common) pastures during summer and autumn in a humid sub-tropical environment. In study 1 (19 January-27 March 1998), 48 cows (36 multiparous, 12 primiparous; 27-96 days postpartum) were allocated to one of four groups based on genetic merit, milk production, liveweight (LW) and days postpartum. They were fed (2.7 kg dry matter (DM) per cow, twice-a-day) one of four isoenergetic and isonitrogenous barley grain-based concentrates containing NaCl at concentrations (% as-fed) of either 0 (SC1), 1.1 (SC2), 2.2 (SC3) or 3.3 (SC4). Maximum temperature humidity index (THImax) was greater than or equal to78 during 50% of the experimental period. Concentrate NaCl content had no effect (P>0.05) on daily milk yield or LW change but daily yields of 4% fat corrected milk (FCM), fat and protein were higher (P<0.05) for cows fed SC3 (16.2 kg, 615 g and 494 g, respectively) compared to cows fed the other concentrates (SC1: 14.2 kg and 546 g fat, 450 g protein, respectively; SC2: 15.0 kg and 553 g fat, 461 g protein, respectively; SC4: 14.2 kg and 529 g fat, 454 g protein, respectively). Daily pasture intake was not different (P>0.05) among treatments at 7.6+/-1.24 kg DM per cow. In study 2 (18 January 1999-1 March 1999), 48 cows (32 pluriparous, 16 primiparous: 32-160 days postpartum) were fed (2.7 kg DM per cow twice-a-day) one of two isoenergetic and isonitrogenous barley grain-based concentrates containing NaCl at concentrations (% as-fed) of 0 (control) or 2.2 (HSC). THImax was greater than or equal to78 during 34% of days in the experimental period. Yields of milk, FCM, fat and protein were lower (P<0.05) for cows fed HSC. LW change, milk fat content and milk protein content were unaffected (P>0.05) by concentrate NaCl content. These studies indicate that NaCl supplementation can be beneficial in terms of milk production during warm, humid conditions as opposed to milder conditions. (C) 2002 Elsevier Science B.V. All rights reserved.
Keyword Agriculture, Dairy & Animal Science
Sodium
Dairy Cows
Sub-tropical
Summer
Autumn
Heat-stress
Dairy-cows
Thermal-stress
Dietary-sodium
Hot Weather
Responses
Cattle
Nutrition
Potassium
Pasture
Q-Index Code C1
Additional Notes This work has resulted in changes to recommendations for feeding supplemental salt to Australian dairy cows based on environmental conditions. Changes in physiological responses of dairy cows fed salt under different climatic in the study was not previously known. This has resulted in further studies being undertaken with beef cattle in Australia and the US. The authors made an equal contribution to this study. DOI: 10.1016/S0377-8401(01)00322-4

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Agriculture and Food Sciences
 
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Created: Tue, 14 Aug 2007, 18:40:48 EST