Effects of Supplementing Various Linoleic to α-linolenic Acid Ratios and Vitamin A on Production Performance and Egg Characteristics of Laying Hens during Summer Months

作     者：S.Ahmad M.Yousaf Z.Kamran M.U.Sohail M.N.Tahir K.C.Koutoulis A.Manzoor 无 

作者机构：University College of Veterinary and Animal SciencesThe Islamia University of Bahawalpur-63100Pakistan Institute of Animal SciencesUniversity of AgricultureFaisalabad-38040Pakistan Department of PhysiologyGC UniversityFaisalabad-38000Pakistan Department of Avian MedicineSchool of Health SciencesUniversity of ThessalyKarditsa-43100Greece Department of Meat Science and TechnologyUniversity of Veterinary and Animal SciencesLahore-54000Pakistan Poultry Production DivisionAl-Watania Poultry Institute of TechnologyAl-Bukayriyah51941Saudi Arabia 

出 版 物：《Journal of Zoological Research》 (动物研究（英文）)

年 卷 期：2019年第1卷第1期

页      面：1-9页

学科分类：0202[经济学-应用经济学] 02[经济学] 020205[经济学-产业经济学] 

主　　题：Egg quality Fatty acids Hot climate Layers performance Vitamin A 

摘      要：In the present feeding trial,responses of laying hens that were kept at high ambient temperature and Fed with various dietary ratios of linoleic acid(LNA)toα-linolenic acid(ALA)and vitamin A levels on production performance and egg quality traits were evaluated.A total of 360 Leghorn laying hens at 40th week of age(average initial body weight;1.79±0.23 kg)were fed with various combinations of canola oil and linseed oil containing diets to achieve LNA to ALA dietary ratios of 20:1,10:1,4:1,2:1,1:1 and 1:2,each supplemented with 3000 or 10000 IU of vitamin A/kg of *** experiment was designed as a 6×2 factorial Completely Randomized Design that continued for 12 *** intake,body weight gain,egg production and egg quality traits were recorded during the *** dietary LNA to ALA ratio or increasing poly unsaturated fatty acids(PUFA)in the diet decreased(P0.05)by dietary *** conversion ratio per kg eggs,egg weight and egg-shell thickness showed a curvilinear(P0.05)response to decreasing dietary LNA to ALA *** the dietary ratio of LNA to ALA of 4:1 or less could produce eggs by the hens with desirable quantities of n-6 and n-3 PUFA–that are characteristics of functional diets–the performance of laying hens in terms of body weight gain and egg-yolk percentage was slightly ***,a 4:1 or 2:1 LNA to ALA combination can make a borderline between the production traits and the feed economics.