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Lysine Requirement of Pigs Weighing 5 to 15 kg Fed Practical Diets with and without Added Fat^1,2,

University of Nebraska³, Lincoln 68583

Abstract

Weanling crossbred pigs (average weight 5 kg) were fed diets containing two levels of fat and six levels of lysine in a 2 x 6 factorial design to determine the lysine requirement of young pigs fed practical diets with and without added fat. The diets were based on corn and soybean meal and contained either 5% sucrose or $% lard. Lysine levels ranged from .95% (basal) to 1.45% in .10% increments. The growth trial was 28 days long and pigs were bled at 14 and 28 days. Feed intake (ADFI), weight gain (ADG), feed efficiency (G:F) and changes in plasma levels of urea and lysine were the response criteria. Dry matter, protein and energy digestibilities of the diets were measured at the end of the growth trial. As expected, the addition of fat caused a decrease in ADFI and an increase in G:F but did not influence ADG. The addition of lysine significantly improved ADG and G:F and tended to increase ADFI (P<.065). Plasma urea levels were not influenced by fat addition, and the response was the same at both bleeding periods. Urea levels decreased in response to added lysine, reaching a plateau at 1.25% dietary lysine, Plasma lysine levels increased with dietary lysine, but the shape of the response was different for the two bleeding periods. At 14 days, it was curvilinear, indicating a lysine requirement of 1.15 to 1.25%; at 28 days, it was linear, suggesting that at this time the requirement was less than .95%. Findings indicate that pigs weighing 5 to 15 kg and fed practical diets containing 19% crude protein require 1.15 to 1.25% lysine. In this experiment, there were no significant fat x lysine interactions and no indication that the addition of fat increased the lysine requirement.

¹ Published as paper number 5907, Journal Series, Nebraska Agr. Exp. Sta. Research reported was conducted under Project 13-052.

² The technical assistance of Mary B. Barnes, Roy L. Carlson, Cecilia M. Stodd and Alice J. Teter is gratefully acknowledged.

³ Dept. of Anim. Sci.

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