Lupin seed meal (<i>Lupinus albus</i> cv. Buttercup) as a source of protein for early weaned piglets

Abstract

Two experiments were conducted to evaluate L. a/bus cv. Buttercup as an alternative to heated full-fat soya bean meal for early weaned piglets. In Experiment 1, the performance of piglets, fed diets with 0%,4%,8% and 12% lupins and formulated to contain equivalent amounts of digestible energy and lysine, was used to evaluate the effect of increasing levels of commercially produced Buttercup seed in the diet. The results obtained led to Experiment 2, conducted to evaluate certified L. a/bus cv. Buttercup seed (at an 8% inclusion level) as a partial replacement of full-fat soya beans, The apparent nitrogen and energy digestibilities of the diets were also determined. The commercial Buttercup lupins had an alkaloid content in excess of 0,05% and the certified seed only 0,01 %. The digestibility of both energy and protein in the diet was not affected by lupin inclusion. Although statistically non-significant (P>0,05), the retention of digested nitrogen was decreased by about 5 and 7% with lupin inclusion in the two trials, The high-alkaloid seeds in Experiment 1 depressed feed intake by as much as 21 %, The low-alkaloid seeds used in Experiment 2 had no effect on feed intake. Growth rate was retarded by 25% when high-alkaloid seeds were used, but by only 6% when low-alkaloid seed was used. Digestible energy utilization was reduced by 2 and 4% with lupin inclusion.

Twee studies is uitgevoer om L. a/bus cv. Buttercup, as 'n alternatief vir verhitte volvetsojaboonmeel in die dieet van vroeggespeende varkles te evalueer, In die eerste studie is die prestasie van varkies, wat diEHemet 0%, 4%, 8% en 12% lupiene en ekwivalente hoeveelhede verteerbare energie (VE) en Iisien bevat het, gebruik om die invloed van toenemende pelle van kommersieel-geproduseerde Buttercup-saad in die dleet, te ondersoek, Die resultate behaal het tot die tweede studie gelei, wat uitgevoer is om gesertifiseerde L. a/bus cv. Buttercupsaad (teen 'n 8%-insluitingspell) as gedeeltelike vervanger vir volvetsojabone, te evalueer. Die waarskynlike stikstof en energieverteerbaarheid van die di~te Is ook bepaal. Die kommersi~le Buttercuplupiene het 'n alkalo'j edlnhoud van meer as 0,05% gehad en die gesertifiseerde saad slegs 0,01 %. Die verteerbaarheid van beide energie en prote'ien In die dieet is nie deur lupienlnsluiting be'fnvloed nie. Hoewel statisties nie betekenisvol nie (P>0,05) is die retensie van verteerde stikstof (N) met omtrent 5 en 7% onderdruk deur lupienlnslulting in die twee studies. Die saad met ho~ alkalo'iedlnhoud wat in die eerste studie gebruik Is, het voerinname met tot 21% verlaag, Daarenteen het saad met lae alkalo'iedinhoud wat in die tweede studie gebruik Is geen effek op voerinname gehad nie. Groeitempo Is met 25% vertraag toe saad met ho~ alkalo'j edinhoud gebruik Is, maar slegs met 6% waar die alkalo'j edlnhoud laag was. VE-benuttlng is met 2 - 4% verlaag met lupleninsluiting in die dleet.

Keywords: White lupins, digestibility, N retention, growth, alkaloids, pigs