Growth curve models for commercial pullets under severe heat stress condition

2009 ◽  
Vol 2009 ◽  
pp. 234-234
Author(s):  
J Fayazi ◽  
M R Ghorbani ◽  
M Nazari ◽  
J Momeni ◽  
A Jaferian ◽  
...  
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Heat Stress ◽  
Growth Curve ◽  
Egg Production ◽  
Harmful Effect ◽  
The Body ◽  
Basic Knowledge ◽  
Growing Period ◽  
Severe Heat Stress

The objectives of our study were to propose a growth curve and to develop a mathematical model to describe the body weight of pullet experiencing severe heat stress (42°C). Poultry producers who raise their own replacement pullets can control their pullet’s growth, condition and development. Many of the problems which occur during the early part of lay can be traced back to insufficient or improper type of body weight attained during the various stages of the growing period. In order to avoid these problems, the body weight of pullets must be controlled. Rearing conditions for pullets vary depending on environmental pressures and can affect growth rate. Without the basic knowledge of the flock grow-out, it is virtually impossible to understand and possibly solve problems which may later occur during the laying period. It must be kept in mind that once egg production begins, it is too late to solve problems resulting from growing period. The two most important criteria of pullet quality are uniformity within the flock and proper body weight at a specific age. Almost anything that adversely affects a pullet will usually be reflected in lower body weights and poorer flock uniformity. High ambient temperatures can be devastating to commercial pullet growth rate; coupled with high humidity they can have an even more harmful effect on proper and recommended body weight. Heat stress interferes with the poultry comfort and suppresses performance efficiency. In order to verify the effect of heat stress on pullet growth rate, many curve modelled, fitted and verified to proposed best one.

Growth-Rates of the Bandicoot Isoodon-Macrourus and the Brushtail Possum Trichosurus-Vulpecula

1993 ◽  
Vol 41 (2) ◽  
pp. 141 ◽  
Author(s):  
RT Gemmell ◽  
JK Hendrikz
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Growth Curve ◽  
Growth Rates ◽  
Post Partum ◽  
Quadratic Equation ◽  
The Body ◽  
Brushtail Possum ◽  
Trichosurus Vulpecula ◽  
Iterative Analysis

Although the bandicoot Isoodon macrourus and the brushtail possum Trichosurus vulpecula give birth to similar-size young, about 200 mg, the pouch young of the bandicoot grow more quickly than those of the possum. The bandicoot is weaned at 59 days when the body weight is between 90 and 250 g. A young possum weighs about 20 g at Day 60 and between 780 and 1031 g when weaned at Day 170-180 post partum. The body weight of both species has been described previously as a continuous curve expressed by a quadratic equation. In this study, instead of assuming the growth curve to be continuous, the growth curve has been expressed as two components. The growth rates of both species were similar from birth until Day 12 post partum; the bandicoot then had a faster growth rate. The results from iterative analysis indicated a change in growth rate at Day 30 (data for Days 31 and 32 were missing) and Day 96 post partum for the bandicoot and possum, respectively. Thus, both marsupials showed a change in growth rate as hair appeared, eyes opened and the young first left the pouch.

scholarly journals Review on the Effect of Heat Stress on Poultry Production and Productivities

2021 ◽  
Vol 6 (2) ◽  
pp. 1-9
Author(s):  
Getachew Bekele
Keyword(s):  
Body Weight ◽  
Heat Stress ◽  
Body Temperature ◽  
Egg Production ◽  
Sperm Concentration ◽  
Reproductive Hormones ◽  
Egg Laying ◽  
The Body ◽  
Feed Consumption ◽  
Poultry Production

Heat stress is a situation where too much heat is absorbed by a person, a plant or an animal and causes stress, illness or even death. Therefore, the objective of this review was to compile current knowledge and evidence from literature about the effects of heat stress in poultry production, and productivities. Heat stress is manifested by elevated body temperature, hot, dry skin, lack of sweating and neurological symptoms such as paralysis, headache, vertigo and unconsciousness. Poultry seems to be particularly sensitive to temperature-associated environmental challenges, especially heat stress. In the first days of their life poultry need hot climate (32-38°C), but the optimal temperature decreases rapidly with age by 2.5-3.0°C per week. Birds may use sand baths to dissipate the heat from the body, move to a shaded area or seek a micro-environment that avoids extremely high environmental temperature. Birds rose in an open-sided house at 37°C and humidity level of 50-60% showed signs of panting and wing lifting, elevation of body temperature, lower feed consumption, a higher feed conversion ratio, and lowered body weight gain. In females, heat stress can disrupt the normal status of reproductive hormones at the hypothalamus and ovary leading to reduced systemic levels and functions. Also in males, semen volume, sperm concentration, number of live sperm cells and motility decrease when subjected to heat stress. In egg production, heat stress has a significant harmful impact on body weight, and feed consumption of laying hens at peak production, egg weight, shell weight, shell thickness, and gravity. Both meat type and egg laying chickens respond negatively to high ambient temperatures. Heat stress reduces the relative weights of lymphoid organs like spleen, thymus and cloacae bursa.

scholarly journals PERFORMANCE OF QUAILS (Coturnix-coturnix japonica) GIVEN DRINK CONTAINING MORINGA LEAF SOLUTION IN THEIR GROWING PERIOD

2019 ◽  
Vol 4 (2) ◽  
pp. 75
Author(s):  
Fatkur Rohman ◽  
Ristika Handarini ◽  
Hanafi Nur
Keyword(s):  
Drinking Water ◽  
Body Weight ◽  
Egg Production ◽  
Body Weight Gain ◽  
Coturnix Japonica ◽  
Feed Conversion ◽  
Coturnix Coturnix ◽  
Growing Period ◽  
Randomized Design ◽  
Completely Randomized Design

Moringa leaves contain phytochemicals which can be used to improve the performance of quails in their growing period.  This study was aimed at assessing the effects of the inclusion of moringa leaf solution in drinking water on the performance of quails.  The study was conducted at Badrupuyuh Farm, Sukajaya Village RT 01/02, Ciomas, Bogor Regency from October to December 2017.  One-hundred quail birds aged 7 days with average initial body weight of 17.87±0.46 g were used.  The birds were fed starter and grower commercial rations.  Moringa leaf solution was given through drinking water.  A completely randomized design with 4 treatments and 5 replicates was used.   Treatments consisted of drinking water containing no moringa leaf solution (R0), drinking water containing 5% moringa leaf solution (R1), drinking water containing 10% moringa leaf solution (R2), drinking water containing 15% moringa leaf solution (R3).  Data were subjected to an analysis of variance and a Duncan test.  Measurements were taken on feed intake, body weight gain (BWG), feed conversion, and mortality rate.  Results showed that there were significant effects (P<0.05) of treatments on BWG in week 2 and 4 and feed conversion in week 2.  No mortality of quails was found.  It was concluded that the inclusion of 10% moringa leaf solution in drinking water could increase BWG in week 2 and 4, improve feed conversion, and maintain the life of quails.  It was recommended that further studies on the effects of moringa leaf solution inclusion in drinking water on egg production in laying period.  Key words: performance, quail, moringa leaf solution

scholarly journals Pertambahan Bobot Badan dan Waktu Pembusukan Daging Ayam Broiler yang Diberi Ekstrak Jaloh Dikombinasi dengan Kromium

2010 ◽  
Vol 10 (2) ◽  
pp. 21-26
Author(s):  
Sugito Sugito ◽  
Erdiansyah Rahmi ◽  
Azhari Azhari ◽  
M. Isa
Keyword(s):  
Drinking Water ◽  
Body Weight ◽  
Heat Stress ◽  
Broiler Chickens ◽  
Room Temperature ◽  
The Body ◽  
Feed Ratio ◽  
Treatment Groups ◽  
Randomized Design ◽  
Completely Randomized Design

The gain body weight and Spoilage of meat broiler which giving jaloh extract to combine with chromiumABSTRACT. A study was conducted on broiler chickens under heat stress to evaluate the effect of combined jaloh (Salix tetrasperma Roxb) extract with chromium mineral in the body weight, value of feed ratio conversion, and time to meat to become decomposed. Twenty four of 20-day old Cobb female broiler chickens were randomly assigned and divided to 4 treatment groups. Completely randomized design was used in this study. The treatments were as follows: 1) chickens given no heat stress and jaloh extract nor chromium (tCp); 2) chickens under heat stress without given jaloh extract nor chromium (Cp); 3) chickens under heat stress and given jaloh extract in 1.000 mg/lt drinking water (Cp+Ej); and 4) chickens under heat stress, given jaloh extract in 1.000 mg/lt drinking water, and chromium in 1.000 ug/lt drinking water (Cp+Ej+Cr). Heat stress given was 33 ± 1oC of cage temperature during 4 hours per day within 15 days. Jaloh extract and chromium treatments in drinking water were given at 2 hour before cage temperature reaching 33 ± 1oC and were stopped being given after 1 hour, when cage temperature back to room temperature. On the 16th day of the study chickens were measured before slaughtered. Samples obtained were chicken meat that taken from breast part (musculus pectoralis). The result suggested that either giving jaloh extract per se at the dose of 1.000 mg/lt in drinking water or combine it with chromium that given two hours before cage temperature reaching 33 ± 1oC, can prevent chickens from decreasing their body weight, decreasing value of feed ratio convertion, and extending time to meat to become decomposed.

scholarly journals The Influence of the Mineral-Microbial Preparation on Ammonia Concentration and Productivity in Laying Hens Houses

Atmosphere ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 751 ◽  
Author(s):  
Remigiusz Gałęcki ◽  
Michał Dąbrowski ◽  
Tadeusz Bakuła ◽  
Kazimierz Obremski ◽  
Adriana Nowak ◽  
...  
Keyword(s):  
Body Weight ◽  
Linear Correlation ◽  
Egg Production ◽  
Laying Hens ◽  
Animal Health ◽  
The Body ◽  
Control Group ◽  
Microbial Composition ◽  
Experimental Group ◽  
Campylobacter Spp

The aim of this study was to evaluate the influence of the biopreparation Deodoric® on ammonia (NH3) concentration, performance, and hygiene standards in laying hen (ROSS-308) production. Statistically significant differences in NH3 concentration and the body weight of laying hens were observed between the control group (C) and the experimental group (E) where Deodoric® was applied at the set dose. In the control group, an increase in NH3 concentration could have contributed to the decrease in the body weight of laying hens, egg production, and % hen day egg production, whereas no such correlations were observed in the experimental group. A moderate linear correlation between NH3 concentration vs. humidity (r = 0.68), air flow (r = 0.48) and weakly linear correlation between NH3 concentration and age of birds (r = 0.27) was noted in group C. In group E, NH3 concentration vs. temperature (r = 0.27) and humidity (r = 0.14) were weakly correlated. Statistical analysis of changes in the microbial counts isolated from manure revealed a significant decrease of mesophilic microorganisms on day 28 decrease of Campylobacter spp. days 14 and 84 in group E. However, for the entire experimental model no statistically significant changes in the number of Campylobacter spp. and mesophilic bacteria were found. The tested preparation did not cause changes in the microbial composition of tissue swabs. Deodoric® contributes to animal welfare by reducing the ammonia concentrations in poultry houses. It is also recommended for use in poultry farms to improve animal health and performance and to generate benefits for producers.

Effect of Growth Rate on Mineral Retention and Body Composition of Growing Lambs

1988 ◽  
Vol 1988 ◽  
pp. 102-102 ◽  
Author(s):  
M Wan Zahari ◽  
J K Thompson ◽  
D Scott
Keyword(s):  
Growth Rate ◽  
Body Composition ◽  
Body Weight ◽  
Calcium Carbonate ◽  
Growth Rates ◽  
Fast Rate ◽  
Basal Diet ◽  
Primary Objective ◽  
The Body ◽  
Secondary Objective

The effects of plane of nutrition on the body composition of growing sheep are very apparent when animals are compared at the same age following different nutritional histories. These differences are, however, less obvious when animals of the same breed and sex are compared at the same body weight and at present there is some conjecture whether composition is affected by growth rate. This uncertainty is not limited to fat and protein but includes the bone and ash, fraction and the ash composition.The primary objective of this trial was to study the effects of different growth rates achieved by feeding different amounts of the same concentrate diet on the composition of empty-body gain and on the retention of minerals by growing lambs. A secondary objective was to examine the effect of adding supplementary calcium carbonate to the basal diet at the fast rate of growth.

scholarly journals The Body Weight Egg Production Paradox

1968 ◽  
Vol 47 (2) ◽  
pp. 498-504 ◽  
Author(s):  
A.W. Nordskog ◽  
D.M. Briggs
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
The Body

scholarly journals Growth curve of Repartida goats reared in the Caatinga region, Brazil

2017 ◽  
Vol 38 (2) ◽  
pp. 1041 ◽  
Author(s):  
Luanna Chácara Pires ◽  
Théa Mírian Medeiros Machado ◽  
Paulo Luiz Souza Carneiro ◽  
João Batista Lopes da Silva ◽  
Andréa Duarte de Holanda Barbosa ◽  
...  
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Growth Curve ◽  
Maximum Growth ◽  
Maximum Growth Rate ◽  
Lower Probability ◽  
High Birth Weight ◽  
Average Growth ◽  
Nutritional Deficit ◽  
Weight Data

This work aimed to determine which non-linear model (Brody, Gompertz, logistic, von Bertalanffy or Richards) best represents the average growth curve of goats, in addition to evaluating the effect of the environment. The weight data of 40 Repartida goats reared in the Brazil Caatinga were included in this study. Weight data was collected every 30 days from birth until 270 days of age. The parameters of the models (A, mature body weight; B, constant of integration; k, maturation rate; m, inflection point) were estimated using the NLIN procedure of SAS. The logistic model showed a slightly higher average fit in comparison to the other models. The absolute growth rate suggests that the maximum growth rate was reached early. The effect of the contemporary groups was significant (P < 0.05), but only for the estimated k parameter. The estimated correlation between the A and k parameters was significant and negative, indicating a lower probability of a high body weight in adulthood. Goats of the Repartida ecotype are characterized by their high birth weight and low weight at maturity, which combined with the nutritional deficit, suggests that these animals have adapted to the adverse conditions of the Brazilian Caatinga region.

scholarly journals Effect of arginine or glutamine supplementation on production, organ weights, interferon gamma, interleukin 6 and antibody titre of broilers

2014 ◽  
Vol 62 (3) ◽  
pp. 348-361 ◽  
Author(s):  
József Szabó ◽  
Emese Andrásofszky ◽  
Tamás Tuboly ◽  
András Bersényi ◽  
Andrea Weisz ◽  
...  
Keyword(s):  
Immune Response ◽  
Body Weight ◽  
Weight Gain ◽  
Interferon Gamma ◽  
Interleukin 6 ◽  
Egg Production ◽  
Body Weight Gain ◽  
The Body ◽  
Glutamine Supplementation ◽  
Organ Weights

The objective of this study was designed to test whether supplementation of the diet with arginine (Arg) or glutamine (Gln) or their combination influences the production, organ weights and humoral immune response of broilers. A total of 432 one-day-old male Ross 308 broiler chickens were divided into 6 treatment groups: control, Arg-0.5%, Arg-1%, Gln-0.5%, Gln-1% and Arg-0.5%+Gln-0.5%. Drinking water and feed were provided ad libitum. On day 18 of the experiment 50% of chickens in each treatment group were immunised with bovine serum albumin. Ten and 21 days after immunisation blood samples were collected to determine the anti-albumin IgY titre, interleukin 6 (IL6) and interferon gamma (IFNG) and to measure the weight of the liver, spleen, bursa of Fabricius and thymus. Arg or Gln supplementation of the diets influenced neither the production nor the organ weights until 18 days of age. Between 18 and 39 days of age both Arg (0.5% and 1%) and Arg + Gln supplementation improved the feed conversion ratio (FCR) by 3.7%, 6.3% and 4.9%, respectively, while Gln-1% worsened it by 15%. Immunisation slightly (−0.79%) depressed the body weight gain of broilers fed the control diet, which was significantly improved by both Arg (0.5 or 1%) and Arg + Gln supplementation. Immunisation increased the weight of the spleen, bursa and thymus and decreased that of the liver. Supplementation with 1% Gln depressed (−5.13%) the body weight gain of the immunised chickens but strongly stimulated the immune response. Supplementations with Arg and Gln did not influence the IL6 and IFNG level of the blood; however, on day 10 after immunisation these two parameters showed a negative correlation with each other. Regarding production, organ weights and immunity, Arg supplementation should be recommended in the grower phase, while Gln supplementation can be useful in pullets raised for egg production, where a good immune response to vaccinations is an important factor.

Growth of lambs receiving a supplementary milk replacer or reared traditionally in a flock of Polish Heath sheep

2018 ◽  
Vol 14 (1) ◽  
pp. 9-19
Author(s):  
Witold Rant ◽  
Marta Luisa Augustin ◽  
Aurelia Radzik-Rant ◽  
Emil Orłowski ◽  
Magdalena Bednarczyk ◽  
...  
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Survival Rate ◽  
Body Weight Gain ◽  
The Body ◽  
Milk Replacer ◽  
Average Birth Weight ◽  
Lower Body Weight ◽  
Similar Body ◽  
Supplementary Feed

The aim of the study was to compare the body weight gain and survival rate of lambs receiving a milk replacer as supplementary feed with lambs reared traditionally. The research was conducted in a flock of Polish Heath sheep. Of 244 lambs born, 42 lambs from multiple births were given supplementary feed. The lambs received the milk replacer until the 35th day of rearing. Body weight was monitored at birth and on days 28, 56 and 100 of life. Reproductive parameters and survival rate of lambs were derived from breeding documentation. There were no significant differences in the survival rate of lambs in the two groups, which was above 80%. The average birth weight of lambs reared traditionally and of those receiving the milk replacer was similar. During the entire rearing period, the lambs that required supplementary feeding grew more slowly. Twin lambs receiving the supplement and twin lambs reared traditionally had similar body weight and daily gains up to the 56th day of life, but the twin lambs receiving supplementary feed had a significantly lower body weight at day 100 and growth rate during the entire rearing period. The growth rate of triplets fed supplementary milk replacer was not significantly different from that of triplets reared traditionally in any period of the study.

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