Range usage and body weight have minor impact on the gastrointestinal passage rate of commercial free-range laying hens

2020 ◽  
Author(s):  
M. Kolakshyapati* ◽  
T.V. Nguyen ◽  
T.Z. Sibanda ◽  
I. Ruhnke
Keyword(s):  
Body Weight ◽  
Laying Hens ◽  
Passage Rate ◽  
Free Range

scholarly journals Body weight and range usage affect net energy utilisation in commercial free-range laying hens when evaluated in net energy chambers

2020 ◽  
Vol 6 (2) ◽  
pp. 192-197
Author(s):  
Manisha Kolakshyapati ◽  
Shu-Biao Wu ◽  
Terence Z. Sibanda ◽  
Santiago Ramirez-Cuevas ◽  
Isabelle Ruhnke
Keyword(s):  
Body Weight ◽  
Laying Hens ◽  
Net Energy ◽  
Free Range

Body weight sub-populations are associated with significant different welfare, health and egg production status in Australian commercial free-range laying hens in an aviary system

2020 ◽  
Author(s):  
T.Z. Sibanda* ◽  
M. Kolakshyapati ◽  
S.W. Walkden-Brown ◽  
J. de Souza Vilela ◽  
J.M. Courtice ◽  
...  
Keyword(s):  
Body Weight ◽  
Egg Production ◽  
Laying Hens ◽  
Free Range

scholarly journals Investigation of the Morphology of Adrenal Glands in Hens Kept in Two Different Housing Systems—A Pilot Study

Animals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 2124
Author(s):  
Franziska Keßler ◽  
Angelika Grümpel-Schlüter ◽  
Christian Looft ◽  
Stefanie Petow
Keyword(s):  
Body Weight ◽  
Adrenal Glands ◽  
Laying Hens ◽  
Stress Hormones ◽  
Housing Conditions ◽  
Adrenal Cells ◽  
Housing Systems ◽  
Chronic Effects ◽  
Negative Effect ◽  
Interrenal Cells

It is difficult to objectively assess the chronic effects of housing systems on livestock and particularly on laying hens. However, this seems to be important in the context of animal welfare. Therefore, we conducted the present study in order to compare the effect of two different housing conditions, single cage (SC) and floor pen (FP), on the morphology of the adrenal gland. A higher amount of interrenal cells, which secrete stress hormones, can lead to a difference in the relation of adrenal and interrenal cells, which could be interpreted as an indication of chronic stress. For this purpose, adrenal glands were extracted, prepared, stained and examined by microscopy, and total area of the cut, total area of interrenal cells and total area of adrenal cells were measured. As a result, all laying hens had a higher percentage of interrenal cells than adrenal cells (FP: interrenal cells/adrenal cells = 78.37%/21.63%; SC: 80.00%/20.00%). The median of adrenal–interrenal ratio did not differ significantly (FP = 0.2503, SC = 0.2499), while the variation of the ratio between laying hens in FP and SC showed a slight tendency of a higher ratio in adrenal glands of FP (p < 0.0870). Body weight and adrenal–interrenal ratio were significantly negatively correlated in laying hens in FP (rS = −0.943, p < 0.0048) but not in SC (rS = −0.162, p = 0.7283). There was no significant correlation between body weight and total cell area for interrenal cells or adrenal cells. Body weight was significantly lower for laying hens kept in SC than for laying hens kept in FP (p < 0.0001). Due to the present results, it can be concluded that keeping laying hens in single cages can have a negative effect on body weight.

scholarly journals Haematological parameters in relation to age, sex and body weight of free-range village chickens (Gallus gallus domesticus) in Maiduguri, Nigeria

2021 ◽  
pp. 78-84
Keyword(s):  
Body Weight ◽  
Haemoglobin Concentration ◽  
The Body ◽  
Haematological Parameters ◽  
Jugular Veins ◽  
Important Indicator ◽  
Free Range ◽  
Body Weights ◽  
Leukocyte Counts ◽  
Apparently Healthy

The haematology of animals including chickens is an important indicator of their health status. It is therefore considered a useful tool in clinical diagnosis. The aim of this study was to investigate the haematological parameters of apparently healthy free range domesticated chickens as influenced by their sex, age and body weights. Blood samples taken from the jugular veins were analysed using standard haematological protocols. PCV, haemoglobin concentration, TRBC, TWBC, differential leukocyte counts, erythrocytes indices (MCV, MCHC and MCH) were measured. The study showed that there were no significant (P>0.05) age-dependent variation in all the measured haematological parameters. However, sex had effect on PCV, TRBC and heterophil count. Male chickens had higher PCV value of (34.4%) and TRBC value of (2.4 × 1012/L) as compared to female chickens with PCV value of (30.5%) and TRBC value of (2.1 × 1012/L). On the other hand, female chickens had higher mean heterophil value of (22.0 × 109/L) and MCHC value of (29.5g/dl) as compared to male chickens with mean heterophil and MCHC values of (16.8 × 109/L) and (25.7g/dl) respectively. There was significant (P<0.05) increase in PCV with increasing body weights in males but not in females. The MCHC decreased significantly (P<0.05) as the body weight increased also in males but not in females. The results of the study indicate that sex and body weights influenced normal haematological parameters of apparently healthy free range domestic chickens in the study environment. Keywords: Age, body weight, haematology, sex, village chicken.

scholarly journals The impact of phenotypic appearance on body weight and egg production in laying hens: A group-size- and experience-dependent phenomenon

2014 ◽  
Vol 93 (7) ◽  
pp. 1623-1635 ◽  
Author(s):  
R.H. Marin ◽  
M.G. Liste ◽  
I. Campderrich ◽  
I. Estevez
Keyword(s):  
Body Weight ◽  
Group Size ◽  
Egg Production ◽  
Laying Hens ◽  
The Impact
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