scholarly journals Use of Amino Acid Imbalanced and Low Protein Starting Rations for the Rearing of Egg Production Type Pullets and Subsequent Performance of These Pullets When Placed on Laying Rations of Varying Protein Levels

1969 ◽  
Vol 48 (4) ◽  
pp. 1351-1358 ◽  
Author(s):  
J.D. Summers ◽  
W.F. Pepper ◽  
E.T. Moran
Keyword(s):  
Amino Acid ◽  
Egg Production ◽  
Subsequent Performance ◽  
Protein Levels ◽  
Low Protein ◽  
Production Type

scholarly journals Effects of Dietary Crude Protein Levels on Fecal Crude Protein, Amino Acids Flow Amount, Fecal and Ileal Microbial Amino Acids Composition and Amino Acid Digestibility in Growing Pigs

Animals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2092
Author(s):  
Zhenguo Yang ◽  
Tianle He ◽  
Gifty Ziema Bumbie ◽  
Hong Hu ◽  
Qingju Chen ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Essential Amino Acid ◽  
Crude Protein ◽  
Growing Pigs ◽  
Protein Levels ◽  
Low Protein ◽  
Dietary Crude Protein ◽  
Amino Acids Composition ◽  
Protein Amino Acids

The purpose of this experiment was to evaluate the effects of low protein corn-soybean meal-based diets on fecal CP, amino acid (AA) flow amount, AA digestibility and fecal and ileal microbial AA composition in growing pigs. Eighteen pigs (initial body weight = 30 ± 1.35) were randomly divided into three groups and fed with basal diets with CP levels of 12%, 15% and 18%, respectively. The Lys, Met + Cys, Thr and Trp level in the 12% CP and 15% CP groups is the same as 18% CP group by the addition of four crystalline Lys, Met + Cys, Thr and Trp to the diet. The results showed that with the decrease of dietary CP level from 18% to 12%, the fecal total nitrogen (N), CP and total AA (TAA) flow amount decreased linearly (p < 0.05). Dry matter (DM) digestibility, CP digestibility, TAA digestibility, essential amino acid (EAA) digestibility and non-essential amino acid (NEAA) digestibility increased linearly with the decrease of dietary CP concentration from 18% to 12%. Compared with 18% CP group, the flow amount of Asp, Ser, Glu, Gly, Tyr, Val, Leu and Phe in feces of pigs in the 15% CP group and 12% CP group decreased significantly, while the flow amount of Arg in the 15% CP group was lower than that in the 18% CP group and 12% CP group. The fecal microbial N and AA of the 15% CP group were higher than those of the 18% CP and 12% CP groups. Fecal TAA flow amount decreased linearly with the decrease of the dietary CP levels from 18% to 12%. Fecal TAA and NEAA flow amount also decreased linearly with the decrease of dietary CP level from 18% to 12%. Except for Glu, Gly, Met, Tyr, Thr and Phe, there were significant differences among the three groups in the composition of 17 kinds of AAs in fecal microorganisms. Among the 17 AA compositions of ileal microorganisms, except Tyr and Lys, the other AAs were significantly different among the three groups (p < 0.05)

scholarly journals Evaluation of the Sulfur Amino Acid Requirements of Commercial Egg Production Type Pullets

1967 ◽  
Vol 46 (1) ◽  
pp. 181-186 ◽  
Author(s):  
R.H. Harms ◽  
B.L. Damron ◽  
P.W. Waldroup
Keyword(s):  
Amino Acid ◽  
Egg Production ◽  
Sulfur Amino Acid ◽  
Production Type ◽  
Amino Acid Requirements

The effect of pre-weaning diet on post-weaning health and performance of 3 week weaned pigs

1987 ◽  
Vol 1987 ◽  
pp. 104-104
Author(s):  
A.L. Lightfoot ◽  
B.G. Miller ◽  
H.H. Spechter
Keyword(s):  
Weaned Pigs ◽  
Subsequent Performance ◽  
Protein Levels ◽  
Low Protein ◽  
Suckling Piglets ◽  
And Performance

An experiment was carried out at Terrington to investigate the effect of pre-weaning solid feed or no pre-weaning feed for suckling piglets using diets of either high or low protein levels. Previous work at Terrington with 3 week weaned pigs showed that post-weaning performance had a big effect on subsequent performance so the trial pigs were monitored through to slaughter. Research at Bristol University showed that “abrupt weaning”, i.e. no pre-weaning feed can reduce post-weaning diarrhoea.

scholarly journals A Low-Protein Diet during Gestation in Rats Activates the Placental Mammalian Amino Acid Response Pathway and Programs the Growth Capacity of Offspring

2010 ◽  
Vol 140 (12) ◽  
pp. 2116-2120 ◽  
Author(s):  
Rita S. Strakovsky ◽  
Dan Zhou ◽  
Yuan-Xiang Pan
Keyword(s):  
Amino Acid ◽  
Mrna Expression ◽  
Protein Diet ◽  
Low Protein Diet ◽  
Lactation Period ◽  
Growth Capacity ◽  
Protein Levels ◽  
Low Protein ◽  
Offspring Growth ◽  
Amino Acid Response

Abstract Placental efficiency is a predictor of fetal growth and development, which is also controlled by maternal gestational health and diet. The present study investigated the effects of a gestational low-protein diet on offspring growth capacity as well as the diet's contribution to altered expression of placental genes associated with the mammalian amino acid response (AAR) pathway. To assess these outcomes, timed-pregnant Sprague Dawley rats were fed a control (C) diet with 18% protein or a low-protein (LP) diet with 9% protein throughout gestation (Expt. 1) or throughout gestation and lactation (Expt. 2). Placentas were collected during natural delivery and quantitative RT-PCR and Western-blot analyses were performed to determine placental mRNA and protein levels. By the end of the lactation period, offspring of dams fed the LP diet had stunted growth in both experiments. mRNA expression of target genes in the AAR pathway, such as activating transcription factor-3 (Atf3), asparagine synthetase (Asns), and Sodium-dependent neutral amino acid transporter-2 (Snat2), was greater in placentas of rats fed the LP diet compared with controls, as were placental ATF4 and p-eIF2α protein levels. The increase in mRNA expression of AAR pathway-associated genes was correlated with the stunting of offspring growth (Atf3: R2 = 0.32, P = 0.086; Asns: R2 = 0.44, P &lt; 0.05; Snat2:R2 = 0.33, P = 0.084). Our study showed that the mammalian AAR pathway in placenta is upregulated by a maternal low-protein diet and this activation may act as a cue for the fetus to develop an adaptive response suited to their predicted postnatal environment, i.e. a more favorable phenotype for their survival.

mRNA expression of ANT genes, productive performance and nitrogen excretion of laying hen by feeding low protein diets and amino acid supplementation

2019 ◽  
Author(s):  
W. Loongyai ◽  
S. Suptavitanakit ◽  
C. Rakangthong ◽  
C. Bunchasak
Keyword(s):  
Amino Acid ◽  
Egg Production ◽  
Egg Quality ◽  
Nitrogen Retention ◽  
Production Performance ◽  
Nitrogen Excretion ◽  
Egg Mass ◽  
Amino Acid Supplementation ◽  
Acid Supplementation ◽  
Low Protein

The study investigated the effects of low protein diet and amino acid supplementation on production performance of laying hens from 49–57 weeks. A total of 135 chickens were divided into 3 groups: 17%CP, 15%CP and 15%CP supplemented with amino acid (AA). The results showed that the 15% CP group consumed less feed (P less than 0.01). Adding AA to 15%CP improved feed intake, Met intake, BWG, egg mass (P less than 0.01) and egg production (P less than 0.05), while FCR and egg quality were not affected. The percentage of abdominal fat and ANT gene expression were highest in the 15%CP + AA group (P less than 0.05). Nitrogen retention in manure of 15% CP + AA hens was lower than in 17%CP (P less tahn 0.01). These results indicated that the reduced-CP diets supplemented with AA improved production performances and decreased nitrogen excretion.

scholarly journals Calculation and Evaluation of Energy: Amino Acid Ratios for the Egg-Production Type Hen

1984 ◽  
Vol 63 (9) ◽  
pp. 1810-1822 ◽  
Author(s):  
P.J. SLAGTER ◽  
P.W. WALDROUP
Keyword(s):  
Amino Acid ◽  
Egg Production ◽  
Production Type
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