3215

3150

كارشناسي ارشد

﴿علوم دامي﴾

اصفهان :دانشگاه صنعتي اصفهان، دانشكده كشاورزي

1384

نه، 148، [II]ص.: جدول

ص. ع. به فارسي و انگليسي

غلامرضا قرباني، مسعود عليخاني

محمد علي ادريس، عبدالحسين سميع

حميد رضا رحماني، مهدي كديور

1396/02/30

كتابنامه

كشاورزي

مهندسي كشاورزي

ID3150

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Abstract The objectives of this study were to investigate the effects of incrementalhydrogenated palm oil HPO and yellow grease YG on in situ nutrients disappearanceand dairy cows performance digestibility blood parameters and chewing behaviorwhen whole cotton seed containing alfalfa based diets with different forage toconcentrate F C ratios were fed In this study eight early lactating Holstein cows 55 din milk in a replicated 4 4 Latin square design with 21 d periods and two Holsteindairy bulls fitted with ruminally and duodenally cannulas were used Treatments were1 0 fat with 34 66 F C ratio Control 2 2 HPO with 34 66 F C ratio HPO 3 2 YG with 34 66 F C ratio YG and 4 2 YG with 45 55 F C ratio YGHF Cowswere allowed to ad libitum consumption of diets fed twice daily as total mixed ration Feeding fat had no effect on dry matter intake DMI but DMI was reduced in highforage diet significantly P 0 001 Diets including fat did not affect milk yield butrelative to Control HPO and YGHF diets YG ration increased milk yield Feeding fattend P 0 06 to increase milk fat but increased milk fat yield significantly P 0 04 High forage ration did not influence milk fat percent and yield compared with YG diet Feeding fat had not affected milk protein percent and yield however comparing withHPO and YGHF diets YG increased milk protein percent and content Total tractdigestibility of DM was higher P 0 04 in YG diet than HPO however it was notaffected by fat Yellow grease tend P 0 06 to decrease DM digestibility in high foragediet Total tract digestibility of CP and fiber constitutes were not affected by treatments but fat and it s sources increased total fatty acid digestibility Compared with thirdtreatment high forage ration had lower digestibility of total fatty acids significantly P 0 05 Pre feeding blood concentration of non esterified fatty acids was higher andlower in fat and high forage diets respectively Eating ruminating and total chewingtime were not affected in first three diets with same F C ratio but high F C dietinfluenced those activities Feeding fat tend P 0 06 to decrease in situ DMdigestibility however HPO diet significantly P 0 05 decreased in situ DMdigestibility Digestibility of crude protein NDF ADF and total fatty acid were notaffected by feeding and source of fat and ratio of F C with exception of cellulosedigestibility that significantly P 0 04 increased with increasing amount of the foragein diet Results of current study suggest that the use of yellow grease in alfalfa haybased diets did not cause milk fat depression and increased production responsescompared with other treatments Chewing behavior were not affected by fat and sourceof fat supplementation but it s were influenced by amounts of physical effective NDF Finally feeding yellow grease did not have detrimental effects on ruminal post ruminaland total tract digestibility of fiber and it s constitutes Furthermore application of lowlevel of forage was optimum for inhibition of adverse effects of rumen active fat

غلامرضا قرباني، مسعود عليخاني

محمد علي ادريس، عبدالحسين سميع

حميد رضا رحماني، مهدي كديور