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Effect of amount of undegradable crude protein in the diets of high-yielding dairy cows on energy balance and reproduction
Year:
2000
Source of publication :
Livestock Production Science
Authors :
Aharoni, Yoav
;
.
Brukental, Israel
;
.
Holtzman, Michal
;
.
Kaim, Moshe
;
.
Volume :
63
Co-Authors:
Bruckental, I., Institute of Animal Science, Agric. Res. Org., Volcani Ctr., P.O., Bet Dagan, Israel
Holtzman, M., Institute of Animal Science, Agric. Res. Org., Volcani Ctr., P.O., Bet Dagan, Israel
Kaim, M., Institute of Animal Science, Agric. Res. Org., Volcani Ctr., P.O., Bet Dagan, Israel
Aharoni, Y., Institute of Animal Science, Agric. Res. Org., Volcani Ctr., P.O., Bet Dagan, Israel
Zamwell, S., Department of Animal Science, Hebrew Univ. Jerusalem, Fac. A., Rehovot, Israel
Voet, H., Department of Animal Science, Hebrew Univ. Jerusalem, Fac. A., Rehovot, Israel
Arieli, A., Department of Animal Science, Hebrew Univ. Jerusalem, Fac. A., Rehovot, Israel
Facilitators :
From page:
131
To page:
140
(
Total pages:
10
)
Abstract:
This trial was designed to investigate effects of the amount of dietary undegradable crude protein (CP) and the ratio of degradable organic matter to degradable CP in the diets of high-yielding dairy cows on milk yield, energy balance and fertility during the first three months postpartum. Forty-five Israeli Holstein cows were assigned to three dietary treatments at 2 d postpartum. Dietary treatments were (1) 16.7% CP, of which 32% was undegradable (control); (2) 16.7% CP, of which 38% was undegradable; and (3) 18.0% CP, of which 35% was undegradable. Corn gluten meal (CGM) was added to diets 2 and 3 in order to increase undegradability. Cows were fed in groups, and diets were offered as a total mixed ration. Intakes of dry matter (DMI) and CP (kg/d) were 23.8 and 3.975, 21.4 and 3.574, and 20.4 and 3.672, for cows on diets 1, 2 and 3, respectively. No significant differences among the three treatments were found for milk yield, milk protein concentration, milk fat, or protein and lactose yields. Control cows lost 35.0 kg of body weight (BW) during the first 27.2 d postpartum, and then started gaining weight. At approximately day 70 the control cows attained their calving weight. Cows on diets 2 and 3 lost 55 kg of BW during 45 d postpartum and, by the end of the trial, these cows still had not attained their calving weight. Change in body condition score (BCS) during the experimental period revealed the same trends. Mean concentrations (mg/100 ml) of ammonia N in ruminal fluids and concentrations of plasma urea N were 14.0 and 20.3, 12.7 and 21.2, and 14.7 and 21.3 for cows on diets 1, 2 and 3, respectively. No significant differences among treatments were detected for any reproduction parameter. It was concluded that the differences between control cows and cows on diets 2 and 3 in DMI, BW and BCS during the first period postpartum cannot be attributed to the level of dietary undegradable CP only but to a more specific effect of CGM. (C) 2000 Elsevier Science B.V.
Note:
Related Files :
Dairy cows
energy balance
Gluten meal
Insulin
Undegradable CP
Show More
Related Content
More details
DOI :
10.1016/S0301-6226(99)00124-4
Article number:
0
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
21737
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:46
You may also be interested in
Scientific Publication
Effect of amount of undegradable crude protein in the diets of high-yielding dairy cows on energy balance and reproduction
63
Bruckental, I., Institute of Animal Science, Agric. Res. Org., Volcani Ctr., P.O., Bet Dagan, Israel
Holtzman, M., Institute of Animal Science, Agric. Res. Org., Volcani Ctr., P.O., Bet Dagan, Israel
Kaim, M., Institute of Animal Science, Agric. Res. Org., Volcani Ctr., P.O., Bet Dagan, Israel
Aharoni, Y., Institute of Animal Science, Agric. Res. Org., Volcani Ctr., P.O., Bet Dagan, Israel
Zamwell, S., Department of Animal Science, Hebrew Univ. Jerusalem, Fac. A., Rehovot, Israel
Voet, H., Department of Animal Science, Hebrew Univ. Jerusalem, Fac. A., Rehovot, Israel
Arieli, A., Department of Animal Science, Hebrew Univ. Jerusalem, Fac. A., Rehovot, Israel
Effect of amount of undegradable crude protein in the diets of high-yielding dairy cows on energy balance and reproduction
This trial was designed to investigate effects of the amount of dietary undegradable crude protein (CP) and the ratio of degradable organic matter to degradable CP in the diets of high-yielding dairy cows on milk yield, energy balance and fertility during the first three months postpartum. Forty-five Israeli Holstein cows were assigned to three dietary treatments at 2 d postpartum. Dietary treatments were (1) 16.7% CP, of which 32% was undegradable (control); (2) 16.7% CP, of which 38% was undegradable; and (3) 18.0% CP, of which 35% was undegradable. Corn gluten meal (CGM) was added to diets 2 and 3 in order to increase undegradability. Cows were fed in groups, and diets were offered as a total mixed ration. Intakes of dry matter (DMI) and CP (kg/d) were 23.8 and 3.975, 21.4 and 3.574, and 20.4 and 3.672, for cows on diets 1, 2 and 3, respectively. No significant differences among the three treatments were found for milk yield, milk protein concentration, milk fat, or protein and lactose yields. Control cows lost 35.0 kg of body weight (BW) during the first 27.2 d postpartum, and then started gaining weight. At approximately day 70 the control cows attained their calving weight. Cows on diets 2 and 3 lost 55 kg of BW during 45 d postpartum and, by the end of the trial, these cows still had not attained their calving weight. Change in body condition score (BCS) during the experimental period revealed the same trends. Mean concentrations (mg/100 ml) of ammonia N in ruminal fluids and concentrations of plasma urea N were 14.0 and 20.3, 12.7 and 21.2, and 14.7 and 21.3 for cows on diets 1, 2 and 3, respectively. No significant differences among treatments were detected for any reproduction parameter. It was concluded that the differences between control cows and cows on diets 2 and 3 in DMI, BW and BCS during the first period postpartum cannot be attributed to the level of dietary undegradable CP only but to a more specific effect of CGM. (C) 2000 Elsevier Science B.V.
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