Publications

Titles

English :

Milk production and composition of Friesian crossbred cows fed rations containing different sources of energy

Arabic :

انتاج و تركيب لبن ابقار الفريزيان الخليط المغذاة على علائق محتوية على مصادر مختلفة من الطاقة

Abstract

Sixteen crossbreed Friesian cows weighing an average 450Kg in early lactation were randomly assigned into four groups, four in each. The first group received a diet containing no supplemented fat, 2nd received diet containing raw soy bean (R-SB) seeds, 3rd received a diet containing heated soy bean (H-SB) and 4th received a diet containing calcium salts fatty acids (Ca-SFA). The diets were formulated to be iso-caloric and iso-nitrogenous. Results showed that the concentration of acid ether extract ( AEE), EE and FA’s in the total mixed rations were higher with added fat, except EE was the lowest with added ca-SEA.DM intake did not significantly differed among the experimental rations Kuminal pH values and concentration of TVEA’s were not significantly affected by added fat. Proportion of acetate was significantly lower with added H-SB and Ca-SFA compared with added R-SB and the control diet. The reflected trends were recorded with values of butyrate and iso-valerate. Adding R-SB , H-SB or Ca-SFA had non-significant effect on the total nitrogen and microbial protein nitrogen in the rumen liquor. Ruminal NPN and NH3-N concentration were significantly lower with added H-SB compared with R-SB and Ca-SFA. The digistabilities of DM and OM were significantly higher with added fat compared with the control diet, however, added H-SB was higher compared with R-SB and Ca-SFA. Lipids digestabilities as AEE, EE and FA’s were significantly higher with Ca-SFA compared with other treatments. No significant differences were observed between digested lipid with feeding R-SB and H-SB, but significant differences were recorded compared with control ration. Acid- ether extract digestibility was increased by 5.57, 6.59, 7.40 and 7.71 % than ether extract digestibility for control. R-SB, H-SB and Ca-SFA, respectively. Crude protein digestibility was significantly higher with added H-SB compared with other experimental rations. The values of TDN and DE increased with fat supplementation. Milk production and FCM increased with added fat except group fed R-SB which was slightly decreased. Although milk fat percentage and milk protein percentage were not significantly affected, the yield of milk fat milk protein were significantly higher with added H-SB. Feeding full fat R-SB or H-SB and Ca-SFA decreased the percentages of short and medium- chain (C4: 0 to C16:0) fatty acids, however, increased long chain fatty acids (LCFA). Generally, saturated fatty acids reduced with added fat compared with the control diet by 10.01, 11.78 and 11.14 with groups fed R-SB, H-SB and Ca-SFA, respectively. However, unsaturated fatty acids were increased with feeding fat as R-SB, H-SB or Ca-SFA compared with no added fat by 21.18, 24.52 and 23.68%, respectively. Finally, it is recommended to use R-SB, H-SB and Ca-SFA as sources of fat and energy in early lactation of lactating cows to reduce the negative effect of adding natural fat to the rations. Keywords: long chain fatty acids, calcium salts fatty acids, raw soy bean, heat soy bean and soap stock.

Publication year

2003

Pages

507-524

Availability location

معهد بحوث الانتاج الحيوانى-شارع نادى الصيد- الدقى - الجيزة

Availability number

Organization Name

Animal Production Research Institute (APRI)

serial title

Egyptian Journal Nutrition and Feed

ISSN