https://search.dev.ndltd.org/etd/massey/oai:mro.massey.ac.nz:10179/4148
type: CreativeWork
name: The nutritional value of ryegrass-white clover leaf protein concentrate : a thesis presented in partial fulfillment [sic] of the requirements for the degree of Doctor Philosophy in Biochemistry at Massey University
description: Leaf Protein Concentrate (LPC ) , which was manufactured from a mixture of Ryegrass and White Clover (Lolium perenne and Trifolium repens) at the Ruakura Agricultural Research Centre , was evaluated as a possible protein source for feeding to chickens . The nutritional value of LPC was compared to that of soybean meal ( SBM ) . LPC was shown to have a lower nutritional value than SBM in the growth trials . The addition of methionine or cystine to the diet containing LPC improved both food utilization and weight gain of the chickens . These growth parameters showed the greatest improvement when 2 g methionine/kg diet was added to the LPC diet. The additional quantity of 2g methionine/kg diet was similar to the amount of sulphur amino acid contributed by LPC to the d i e t ; 1.8 g sulphur amino acid from L PC /kg diet. When an equivalent amount of cystine (1.6g) to methionine , on a sulphur basis , was added to the LPC d i e t and fed to chickens , it was shown to support the same amount of growth and maintain a similar food utilisation level as additional methionine . LPC contributed only 0.6g cystine/kg of diet . As this was much lower than the added cystine and/or methionine , it was concluded that the availability of cystine in the whole diet was reduced by the presence of LPC rather than the lack of availability of cystine in LPC alone . The following information was also obtained : - (i) Pancreatic hypertrophy and increased pancreatic enzyme activity (trypsin and chymotrypsin ) occurred due to feeding the LPC diet . (ii) The invitro exhaustive enzyme digestibility study indicated that while the overall digestibility of LPC was approximately 6% lower than that of SBM, none of the individual amino acid digestibility estimates i n LPC diverged markedly from the mean . All LPC amino ac ids were released equally by enzyme hydrolysis . (iii) In contrast to the invitro findings , the in vivo mean amino acid availability estimates for the ingredient LPC (as measured in …
abstract: Leaf Protein Concentrate (LPC ) , which was manufactured from a mixture of Ryegrass and White Clover (Lolium perenne and Trifolium repens) at the Ruakura Agricultural Research Centre , was evaluated as a possible protein source for feeding to chickens . The nutritional value of LPC was compared to that of soybean meal ( SBM ) . LPC was shown to have a lower nutritional value than SBM in the growth trials . The addition of methionine or cystine to the diet containing LPC improved both food utilization and weight gain of the chickens . These growth parameters showed the greatest improvement when 2 g methionine/kg diet was added to the LPC diet. The additional quantity of 2g methionine/kg diet was similar to the amount of sulphur amino acid contributed by LPC to the d i e t ; 1.8 g sulphur amino acid from L PC /kg diet. When an equivalent amount of cystine (1.6g) to methionine , on a sulphur basis , was added to the LPC d i e t and fed to chickens , it was shown to support the same amount of growth and maintain a similar food utilisation level as additional methionine . LPC contributed only 0.6g cystine/kg of diet . As this was much lower than the added cystine and/or methionine , it was concluded that the availability of cystine in the whole diet was reduced by the presence of LPC rather than the lack of availability of cystine in LPC alone . The following information was also obtained : - (i) Pancreatic hypertrophy and increased pancreatic enzyme activity (trypsin and chymotrypsin ) occurred due to feeding the LPC diet . (ii) The invitro exhaustive enzyme digestibility study indicated that while the overall digestibility of LPC was approximately 6% lower than that of SBM, none of the individual amino acid digestibility estimates i n LPC diverged markedly from the mean . All LPC amino ac ids were released equally by enzyme hydrolysis . (iii) In contrast to the invitro findings , the in vivo mean amino acid availability estimates for the ingredient LPC (as measured in …
author: Johns, David Carville
keywords: Ryegrass, Lolium perenne, White clover, Trifolium repens, Chicken feed, Poultry feed, Protein, Animal nutrition
date published: 1983
date modified: 2026-07-27T20:17:35Z
provider: Massey University
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Massey University