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Effects of feeding propylene glycol on dry matter intake, lactation performance, energy balance and blood metabolites in early lactation dairy cows

Published online by Cambridge University Press:  01 October 2009

Q. Liu ,
C. Wang ,
W. Z. Yang ,
W. W. Zhang ,
X. M. Yang ,
D. C. He ,
K. H. Dong  and
Y. X. Huang
Q. Liu*
Affiliation:
College of Animal Sciences and Veterinary Medicines, Shanxi Agricultural University, Taigu 030801, Shanxi, P. R. China
C. Wang
Affiliation:
College of Animal Sciences and Veterinary Medicines, Shanxi Agricultural University, Taigu 030801, Shanxi, P. R. China
W. Z. Yang
Affiliation:
College of Animal Sciences and Veterinary Medicines, Shanxi Agricultural University, Taigu 030801, Shanxi, P. R. China Agriculture and Agri-Food Canada, Research Centre, PO Box 3000, Lethbridge, AB, Canada
W. W. Zhang
Affiliation:
College of Animal Sciences and Veterinary Medicines, Shanxi Agricultural University, Taigu 030801, Shanxi, P. R. China
X. M. Yang
Affiliation:
Institute of Animal Science, Shanxi Academy of Agricultural Science, Taiyuan 030032, Shanxi, P. R. China
D. C. He
Affiliation:
Institute of Animal Science, Shanxi Academy of Agricultural Science, Taiyuan 030032, Shanxi, P. R. China
K. H. Dong
Affiliation:
College of Animal Sciences and Veterinary Medicines, Shanxi Agricultural University, Taigu 030801, Shanxi, P. R. China
Y. X. Huang
Affiliation:
College of Animal Sciences and Veterinary Medicines, Shanxi Agricultural University, Taigu 030801, Shanxi, P. R. China
*
†E-mail: [email protected]
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Abstract

The objectives of this study were to evaluate effects of feeding propylene glycol (PG) on feed intake, milk yield and milk composition, blood metabolites and energy balance in Holstein dairy cows from 1 to 63 days in milk. Thirty-two multiparous cows, blocked by lactation number, previous 305-day milk production and expected calving date, were arranged into four groups in a randomized block design. Treatments were: control, low PG, medium PG and high PG with 0, 150, 300 and 450 ml PG per cow per day, respectively. The supplement of food grade PG (0.998 g/g PG) was hand-mixed into the top one-third of the daily ration. Cows were fed ad libitum a total mixed ration consisting of forage and concentrate (50 : 50, dry matter basis). Feed intake, milk yield and milk components were not affected (P > 0.05) by PG supplementation. Overall, body weight (BW) loss tended (P < 0.08) to be linearly reduced, and energy status was linearly improved with increasing PG supplementation. Concentrations of glucose in plasma were higher for cows fed PG relative to control (55.6 v. 58.9 mg/dl) and linearly increased (P < 0.01) with increasing PG supplementation. Plasma concentrations of non-esterified fatty acids and beta-hydroxybutyrate were linearly increased, but urine acetoacetate concentration was quadratically changed with the highest for control diet and the lowest for 450 ml/day of PG. These results indicated that supplementation of PG in the early lactating cow diets had minimal effects on feed intake and milk production, but may potentially reduce contents of milk fat and milk protein. Supplementation of early lactating dairy cow diets with PG is beneficial in terms of improving energy status and reducing BW loss.

Keywords

propylene glycollactation performanceenergy balanceblood metabolitesdairy cows
Type
Full Paper
Information
animal , Volume 3 , Issue 10 , October 2009 , pp. 1420 - 1427
Copyright
Copyright © The Animal Consortium 2009

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