Genetic improvement of egg laying traits in Fayoumi chickens bred under conditions of heat stress through selection and gene expression studies

Radwan, Lamiaa M.

doi:10.1016/j.jtherbio.2020.102546

Cited by 20 publications

(16 citation statements)

References 27 publications

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“…Hot environments could increase blood, rectal and uterine temperatures [ 28 ], suppress ovarian cyclicity, follicle selection and ovulation [ 9 ] and egg laying capability [ 29 ]. In this study, the number of primordial follicles and primary follicles, and the diameter of primary follicle were significantly higher in geese raised at 29 °C.…”

Section: Discussionmentioning

confidence: 99%

Brooding Temperature Alters Yolk Sac Absorption and Affected Ovarian Development in Goslings

Liu

Chen²,

Zhao³

et al. 2022

Animals

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In order to explore the brooding temperature on the absorption of yolk sac and the ovary development of goslings, 126 1-day-old female goslings were randomly divided into three groups with three replicates in each group. The brooding temperatures were set at 32 °C, 29 °C and 26 °C (represent G32, G29 and G26), respectively, in each group. At 48, 60 and 72 h, two goslings from each replicate were weighed, and the yolk sac was collected and weighed. The fatty acid composition of yolk sac fluid was determined by gas chromatography-mass spectrometry (GC-MS). At 1, 2, 3, and 4 weeks of age, goslings from each replicate were weighed, the ovaries were weighed and fixed for hematoxylin-eosin (HE) staining, Cell cycle checkpoint kinase 1 (CHK1), fibroblast growth factor 12 (FGF12) and Sma-and Mad-related protein 4 (SMAD4) which related to regulation of ovarian development were determined by qRT-PCR. The body weight of G29 and G26 was significantly higher than that of G32 at 72 h (p < 0.05). The contents of C14:0, C16:0, C18:2n6c and total fatty acid (ΣTFA) from G32 were significantly higher than that of G26 (p < 0.05), and the contents of C18:1n9t and C22:0 in G29 were significantly higher than that of G26 (p < 0.05). The ovary index, ovary and body weight were significantly higher in G29 than those of G32 and G26 at 2 weeks of age (p < 0.05). The number of primordial follicles, number of primary follicles and diameter of primary follicles were significantly higher in G29 than those in G32 and G26 at 4 weeks of age (p < 0.05). In G29, the expression of CHK1 and SMAD4 was significantly higher than that in G32, and the expression of FGF12 and SMAD4 was significantly higher (p < 0.05) than that in G26 at 2 and 4 weeks of age. In conclusion, brooding temperature at 29 °C could promote the absorption of fatty acids in yolk sac, body weight gain, and ovarian development through up-regulating the expression of CHK1, FGF12 and SMAD4.

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Section: Discussionmentioning

confidence: 99%

Brooding Temperature Alters Yolk Sac Absorption and Affected Ovarian Development in Goslings

Liu

Chen²,

Zhao³

et al. 2022

Animals

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“…HS adversely affects by reducing egg production and egg quality (Barrett et al, 2019). However, the genetic selection of birds helps in reducing the decline in egg production performance and egg quality in laying hens (Radwan, 2020). Fine-mapping with quantitative trait loci (QTL) is also effective for the screening of high HS tolerant birds.…”

Section: Selection Of Breeding Stockmentioning

confidence: 99%

“…Several additives such as vitamins, minerals, probiotics and herbal products are consistently used to overcome the HS effects (Sahin et al, 2006;Sohail et al, 2011;Tang et al, 2018). Breeding of selective high-performance heat resistant birds is also employed to produce the best progeny (Radwan, 2020).…”

Section: Introductionmentioning

confidence: 99%

Heat stress management in poultry

Goel

2021

Animal Physiology Nutrition

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An increase in the environmental temperature is unfavourable for livestock production worldwide. Poultry is one of the crucial industries that count for high-quality protein production. High ambient temperature is the major stressors in the poultry production system. Heat stress (HS) arises due to a negative balance between the energy released in terms of produced by the system. Based on the duration of exposure, it can be classified as long-term (chronic or cyclic) and short-term (acute) HS. Relative humidity plays an important role in intensifying the effect of HS. Making temperature-humidity index (THI) a vital tool for identifying the appropriate temperature for rearing the birds. HS has a severe effect on growth performance, feed intake, egg production and, quality, and increase mortality in chickens (Awad et al., 2019;Barrett et al., 2019). The occurrence of these effects is channelized through various modifications taking place inside the body. The identification of these modifications is critical in overcoming the distress. An increase in body temperature due to respiratory alkalosis has been identified as a dependable marker to evaluate the HS possessions in chickens (Barrett et al., 2019;Franco-Jimenez et al., 2007). Moreover, the gut is the foremost organ that is exposed to the external material in the form of

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“…Heat stress decreases feed intake and has a general negative impact on behavior, performance (egg production, egg quality), growth and health (66). Some crossbreeds used in free range production are more resilient to heat stress than pure breeds (67). When there is no shadow available on the range, hens stay indoors to avoid the sunshine (68).…”

Section: Thermal Stressmentioning

confidence: 99%

Welfare issues and potential solutions for laying hens in free range and organic production systems: A review based on literature and interviews

et al. 2022

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In free-range and organic production systems, hens can make choices according to their needs and desires, which is in accordance with welfare definitions. Nonetheless, health and behavioral problems are also encountered in these systems. The aim of this article was to identify welfare challenges observed in these production systems in the EU and the most promising solutions to overcome these challenges. It is based on a review of published literature and research projects complemented by interviews with experts. We selected EU specific information for welfare problems, however, the selected literature regarding solutions is global. Free range use may increase the risk of infection by some bacteria, viruses and parasites. Preventive methods include avoiding contamination thanks to biosecurity measures and strengthening animals' natural defenses against these diseases which can be based on nutritional means with new diet components such as insect-derived products, probiotics and prebiotics. Phytotherapy and aromatherapy can be used as preventive and curative medicine and vaccines as alternatives to antibiotics and pesticides. Bone quality in pullets and hens prevents keel deviations and is favored by exercise in the outdoor range. Free range use also lead to higher exposure to variable weather conditions and predators, therefore shadow, fences and guard animals can be used to prevent heat stress and predation respectively. Granting a free range provides opportunities for the expression of many behaviors and yet many hens usually stay close to the house. Providing the birds with trees, shelters or attractive plants can increase range use. Small flock sizes, early experiences of enrichment and personality traits have also been found to enhance range use. Severe feather pecking can occur in free range production systems, although flocks using the outdoor area have better plumage than indoors. While many prevention strategies are facilitated in free range systems, the influence of genetics, prenatal and nutritional factors in free range hens still need to be investigated. This review provides information about practices that have been tested or still need to be explored and this information can be used by stakeholders and researchers to help them evaluate the applicability of these solutions for welfare improvement.

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Genetic improvement of egg laying traits in Fayoumi chickens bred under conditions of heat stress through selection and gene expression studies

Cited by 20 publications

References 27 publications

Brooding Temperature Alters Yolk Sac Absorption and Affected Ovarian Development in Goslings

Brooding Temperature Alters Yolk Sac Absorption and Affected Ovarian Development in Goslings

Heat stress management in poultry

Welfare issues and potential solutions for laying hens in free range and organic production systems: A review based on literature and interviews

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