Physiological relationships with production measures in White Leghorns subjected to restricted feeding from 18 weeks of age

1987 ◽  
Vol 38 (2) ◽  
pp. 445 ◽  
Author(s):  
PC Glatz ◽  
RW Polkinghorne ◽  
B Howard
Keyword(s):  
Metabolic Rate ◽  
Conversion Efficiency ◽  
Shell Thickness ◽  
Free Access ◽  
Restricted Feeding ◽  
Feed Conversion ◽  
Water Turnover ◽  
Egg Weight ◽  
Feed Conversion Efficiency ◽  
Egg Number

The relationships between 22-42 week production measurements (egg number, egg weight, feed conversion efficiency, carcass fat, shell thickness and body weight) and a number of physiological measures (metabolic rate, water turnover, thyroxine secretion rate and plasma thyroxine concentration) were examined in purebred and strain-cross White Leghorn hens. Feed intakes were restricted to 80, 90 or 100 g 24h-1 and comparisons made with birds allowed free access to feed (average 127 g 24h-1). Restricted feeding significantly depressed all production measures except egg weight and shell thickness, and also reduced metabolic rate but elevated the plasma thyroxine concentration. Strain-cross hens laid more and heavier eggs, and showed a better feed conversion efficiency than purebreds in association with reduced metabolic rates, thyroxine secretion rates and plasma thyroxine concentrations. Water turnover was the only physiological measure to be consistently related to production measurements, and in the case of egg number, egg weight and shell thickness, different relationships were demonstrated in restricted compared with fully fed birds.

Ad libitum versus restricted feeding of barley- and corn-based feedlot diets

1995 ◽  
Vol 75 (4) ◽  
pp. 637-640 ◽  
Author(s):  
G. W. Mathison ◽  
D. F. Engstrom
Keyword(s):  
Key Words ◽  
Conversion Efficiency ◽  
Feed Restriction ◽  
Restricted Feeding ◽  
Feed Conversion ◽  
Feed Conversion Efficiency ◽  
Designed Experiment ◽  
Ad Libitum ◽  
Corn Grains

A 2 × 2 factorially designed experiment in which barley or corn grains were fed ad libitum or at 96% ad libitum to 100 steers was conducted to test the hypothesis that type of grain fed would affect any responses in feed conversion efficiency obtained by restricting intake. Feed restriction resulted in a 22% reduction (P = 0.01) in fat cover but the numerical improvement in feed conversion efficiency of 3% was not significant (P = 0.32). Grain type had no detectable influence on feed-lot performance. Key words: Ad libitum, restricted feeding, steers, barley, corn, feedlot

scholarly journals AAntibiotic use to the production performance of ISA brown layer

2017 ◽  
Vol 2 (4) ◽  
pp. 541-546
Author(s):  
Md Khalaydur Rahman ◽  
Md Kamrul Hasan Majumder ◽  
Md Yousuf Ali ◽  
Most Mahfuja Khatun ◽  
Sarkar Enayet Kabir ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Egg Production ◽  
Laying Hens ◽  
Normal Diet ◽  
Production Performance ◽  
Feed Conversion ◽  
Egg Weight ◽  
Feed Conversion Efficiency ◽  
Different Doses

The present study was designed with a view to study the effects of enrofloxacin antibiotic on ISA brown layer performance. A total of 1,80,000 laying hens (ISA brown) received and supplied enrofloxacin antibiotic in the dose of 0 mg, 10mg and 20 mg/kg BW with normal diet. Each layer was fed 120 g feed/day from 42 to 48 weeks of age. Antibiotic made significant differences in egg production (p<0.05) and especially on mortality (p<0.01). The different doses of enrocin (0 mg, 10mg and 20mg/kg BW) had no significant effect on feed conversion efficiency and egg weight. Therefore, it can be suggested that a lower dose (10mg/kg BW) of antibiotic may be benefited in commercial layer diet.Asian J. Med. Biol. Res. December 2016, 2(4): 541-546

scholarly journals Evolution in Configuration and Productivity of New Zealand Hill Country Sheep and Beef Cattle Systems

Agriculture ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 531
Author(s):  
Januarius Gobilik ◽  
Stephen Todd Morris ◽  
Cory Matthew
Keyword(s):  
New Zealand ◽  
Beef Cattle ◽  
Conversion Efficiency ◽  
Production Systems ◽  
Metabolic Energy ◽  
Meat Production ◽  
Feed Conversion ◽  
Feed Conversion Efficiency ◽  
Hill Country ◽  
Cattle Systems

Metabolic energy budgeting (MEB) was used to evaluate evolution over 30 years (1980–1981 to 2010–2011) in New Zealand southern North Island ‘hill country’ sheep and beef cattle systems. MEB calculates energy required by animals for body weight maintenance, weight gain or loss, pregnancy, and lactation to estimate the system feed demand and thereby provide a basis for calculating feed conversion efficiency. Historic production systems were reconstructed and modeled using averaged data from industry surveys and data from owners’ diaries of three case-study farms and reviewed for patterns of change over time. The modeling indicated that pasture productivity was 11% lower and herbage harvested was 14% lower in 2010–2011 than in the early 1980s. This productivity decline is attributable to warmer, drier summer weather in recent years. However, primarily through increased lambing percentage, feed conversion efficiency based on industry data improved over the study period from 25 to 19 kg feed consumed per kg lamb weaned, while meat production rose from 137 to 147 kg per ha per year. Similar improvements were observed for the three case farms. The New Zealand MEB model was found effective for analysis of tropical beef production systems in Sabah, Malaysia.

Heterozygous depletion of pik3r1 improves growth and feed conversion efficiency in Gibel carp (Carassius gibelio)

Aquaculture ◽  
2021 ◽  
pp. 737207
Author(s):  
Jianfei Huang ◽  
Chuang Shi ◽  
Yanping Gao ◽  
Jingzhi Su ◽  
Yuqin Shu ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Gibel Carp ◽  
Feed Conversion ◽  
Feed Conversion Efficiency ◽  
Carassius Gibelio

scholarly journals Effect of forage to concentrate ratio and duration of feeding on growth and feed conversion efficiency of male lambs

2018 ◽  
Vol 2 (4) ◽  
pp. 419-427 ◽  
Author(s):  
Noel A Claffey ◽  
Alan G Fahey ◽  
Vasiliki Gkarane ◽  
Aidan P Moloney ◽  
Frank J Monahan ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Carcass Weight ◽  
Feed Conversion ◽  
Fresh Weight ◽  
Viable Option ◽  
Financial Return ◽  
Feed Conversion Efficiency ◽  
Ad Libitum ◽  
The Cost ◽  
Concentrate Inclusion

Abstract Rations (DM basis) for spring-born male lambs consisting of concentrates ad libitum (CON), 50:50 (50% concentrate:50% forage), and forage ad libitum (FORG) were evaluated across feeding periods of three durations (36, 54, and 72 d). Lambs on CON diets were offered ad libitum access to concentrate along with 400 g of fresh weight silage (daily), while 50:50 diets were offered 0.9 and 3.0 kg of concentrate and silage, respectively. Lambs on FORG were offered ad libitum access to 25.5% DM silage. These rations were fed to 99 spring-born male Texel cross Scottish Blackface lambs which were assigned to a 3 × 3 factorial arrangement. Lambs were slaughtered following completion of their respective treatments. Lambs fed CON diets had greater ADG, FCE, and carcass weight (P &lt; 0.001) and carcasses with greater conformation score (P &lt; 0.001) than lambs fed 50:50 or FORG diets. Duration of feeding had no effect on production variables across all three concentrate inclusion levels. It was concluded that the inclusion of concentrates is needed to adequately finish lambs fed indoors. Feeding lamb’s 50:50 diets resulted in modest responses and may be a viable option for finishing lambs or to maintain growth in lambs when the cost of concentrate feed is high relative to the financial return on the lamb meat.

scholarly journals Effects of feed intake and genetics on tissue nitrogen-15 enrichment and feed conversion efficiency in sheep1

2015 ◽  
Vol 93 (12) ◽  
pp. 5849-5855 ◽  
Author(s):  
L. Cheng ◽  
C. M. Logan ◽  
R. J. Dewhurst ◽  
S. Hodge ◽  
H. Zhou ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Feed Intake ◽  
Feed Conversion ◽  
Feed Conversion Efficiency ◽  
Tissue Nitrogen

scholarly journals Feed Conversion Efficiency (FCE) in Relation to Reproductive Performance of Sow

2018 ◽  
Vol 7 (1) ◽  
pp. 2915-2919
Author(s):  
Kandarpa Boruah ◽  
Jitendra Saharia ◽  
Simson Soren ◽  
Karuna Saikia ◽  
Arindam Chakraborty ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
Reproductive Performance ◽  
Feed Conversion ◽  
Feed Conversion Efficiency

scholarly journals Effect of Diatomaceous Earth on Growth Rate, Egg Production, Feed Conversion Efficiency and Parasitic Load in Hens Raised on Deep Litter

2021 ◽  
Vol 3 (1) ◽  
pp. 97-103
Author(s):  
Robert Alex Isabirye ◽  
Savino Biryomumaisho ◽  
James Okwee-Acai ◽  
Samuel Okello ◽  
George William Nasinyama
Keyword(s):  
Growth Rate ◽  
Conversion Efficiency ◽  
Egg Production ◽  
Diatomaceous Earth ◽  
Agricultural Research ◽  
Ascaridia Galli ◽  
Feed Conversion ◽  
Indigenous Chicken ◽  
Feed Conversion Efficiency ◽  
Treatment Groups

The efficacy of diatomaceous earth (DE) on growth rate, egg production and on increasing feed conversion efficiency in deep litter raised layer hens was evaluated. The study was conducted at Mukono Zonal Agricultural Research and Development Institute (MUZARDI) in Uganda. Worms were collected from fresh intestines of indigenous chicken obtained from Kalerwe chicken market near Kampala. The DE was mined in Pakwach (formerly Nebbi) district in Northern Uganda. Chickens of the Lohmann Brown breed raised on deep litter were studied. At 7 weeks the birds were divided into 5 treatment groups, A, B, C, D and E each composed of 40 birds. Groups C, D and E were given an oral dose containing 250 embryonated eggs of A. galli while groups A and B were not infected. The chicks were weighed; and subjected to feeding trials as arranged below: A – Non-infected birds on DE (4%) supplemented diet; B –non-infected birds on neither piperazine (a conventional de-wormer) nor DE; C – infected birds on DE supplemented diet; D – infected birds on piperazine; and group E – infected birds on neither DE nor piperazine applied. Fecal samples were collected and analysed in the laboratory biweekly at week 16 till week 22 respectively for fecal egg counts. In a subsequent experiment, day-old layer chicks from Lohmann Brown strain but different from those used in earlier experiments, were used to assess the effect of DE on egg production. At 17 weeks of age the 420 were divided as follows: 6 treatment groups each having 7 replicates and each replicate having 10 birds. This study showed that DE can be used successfully in growing pullet diets to correct nutritional mineral imbalance since it supplies more than 14 trace elements and other elements. Diatomaceous earth also enables pullets to cope with Ascaridia galli load; and 2% DE supplementation did not have significant improvement on egg production as compared to no supplementation at all. However, reduction in egg production was experienced when supplementation with levels of DE higher that 2% was applied. Results from biweekly fecal analyses showed significant differences in fecal egg counts (p<0.05); and treatment by group (p<0.05).

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