Effect of Protected Lysine and Methionine as Feed Additives on the Productive Performance of Some Dairy Animals | ||||
| مجلة البحوث والدراسات الإفريقية ودول حوض النيل | ||||
| Articles in Press, Accepted Manuscript, Available Online from 07 August 2023 | ||||
| Document Type: مقالات بحثية | ||||
| DOI: 10.21608/mbddn.2023.219526.1057 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Wael Elkot  1; Mohamed Mousa2; Kasem Mohamed3; Fatma Oraby4
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| 1Dairy Science and Technology Department, Faculty of Agriculture & Natural Resources, Aswan University | ||||
| 2Nutrition and Clinical Nutrition Department, Faculty of Veterinary Medicine, Sohag University | ||||
| 32Natural Resources, Institute of African and Nile Basin States Researches & Studies, Aswan University | ||||
| 4Natural Resources, Institute of African and Nile Basin States Researches & Studies, Aswan University | ||||
| Abstract | ||||
| The study aimed to assess the impact of essential amino acids, specifically lysine and methionine, on the diets of Holstein dairy cows. Thirty healthy, high-yielding cows aged three to four years were divided into three groups: control, lysine, and lysine plus methionine. The results revealed significant variations in dry matter intake (DMI) among the groups. The total solids (TS) percentage was higher in the lysine plus methionine group (13.63%) and the lysine group (13.46%) compared to the control group. Regarding fat-corrected milk (FCM), the group receiving lysine plus methionine demonstrated thehighest increase (43.46), followed by the lysine group (39.36), while the control group had a lower increase (36.81). After calving, the control group exhibited a higher concentration of beta-hydroxybutyrate (BHBA) (1.29 mmol/L), whereas the lowest concentration (0.81 mmol/L) on day 28 was observed in the lysine plus methionine group, followed by the lysine group (1.08 mmol/L). Non-esterified fatty acids (NEFA) concentration decreased in all treatments before and after parturition. The composition of certain fatty acids was not affected, except for a higher level of C15:0 in the lysine plus methionine group (6.81%). Both essential and non-essential amino acids displayed significant differences among the various groups. In conclusion, the different treatment groups exhibited significant variances in DMI, TS%, FCM, BHBA concentration, NEFA concentration, and certain fatty acid composition. Moreover, essential and non-essential amino acids also demonstrated significant differences across the groups. | ||||
| Keywords | ||||
| Feed Additives; Productive Performance; Milk; Lysine; Methionine | ||||
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