Effects of feeding strategies during lay on broiler breeder production performance, eggshell quality, incubation traits, and behavior

Emous, R.A. van

doi:10.1016/j.psj.2023.102630

Cited by 4 publications

(4 citation statements)

References 35 publications

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“…If peak production remains consistent for a longer period, it is advisable to adjust Ca and phosphorus concentrations to those of the next feeding phase [32]. Adjustment of feeding timing for the required nutrients through AM/PM feeding in that time may add some value to enhance the production rate [34]. This might support other studies [18,20] where hens under split feeding showed a tendency to increase egg production more than those offered a conventional diet.…”

Section: Discussionsupporting

confidence: 53%

“…There were also no visible effects on other egg quality traits except the higher yolk colour scores in eggs laid by AM/PM hens compared with the control hens. Other studies also observed no effects on egg quality when diets were split into different parts of the day [20,34,37]. The higher yolk colour score in AM/PM eggs may be due to higher consumption of materials from the range during ranging, which contain natural pigments such as insects, plants, flowers, and grasses compared with the control hens.…”

Section: Discussionmentioning

confidence: 93%

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Effects of AM/PM Diets on Laying Performance, Egg Quality, and Nutrient Utilisation in Free-Range Laying Hens

Jahan,

Dao,

Morgan

et al. 2024

Applied Sciences

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Laying hen nutrient requirements change throughout the day, due to the cyclic nature of egg formation. Generally, more energy and protein are required in the morning when the albumen is deposited around the yolk, and more calcium is required in the evening when the eggshell is formed. The aim of this study was to determine if feeding laying hens diets tailored to their specific nutritional and physiological requirements throughout the day, by feeding higher levels of protein and energy in the morning and higher levels of calcium in the evening, is more beneficial than feeding one diet all day. Hy-Line Brown laying hens (n = 360) were housed in free-range floor pens (18 pens with 20 hens/pen) from 34 to 53 weeks of age (WOA). Half of the birds (n = 180, nine replicate pens) were fed a conventional layer hen diet all day (control) and the remaining birds (n = 180, nine replicate pens) were fed an AM diet from 08:00 h to 16:00 h and PM diet from 16:00 h to 08:00 h (AM/PM). From 39 WOA, hens were given access to an outdoor range from 09:00 h to 18:00 h via pop holes. Egg weight and hen-day egg production were measured daily, and feed consumption and the feed conversion ratio (FCR) were measured weekly. Hen weight and egg size uniformity were determined at 43 and 53 WOA, and egg quality was measured at 53 WOA. A total of 72 hens (4 hens/pen, 36 hens/treatment) were euthanised at 53 WOA to determine ileal apparent energy and nitrogen digestibility. A cost–benefit analysis for the study period, based on feed costs and egg mass, was calculated. Overall, the results showed that the AM/PM treatment increased egg mass by 2.15% (60.4 vs. 59.1 g/hen/day, p = 0.086) and improved feed efficiency by 8.34% (2.231 vs. 2.436 kg feed/kg egg, p = 0.030) compared with the control. A higher yolk colour score was observed in eggs from hens on the AM/PM treatment (p = 0.002), but no other significant effects of the treatments on egg quality were observed. Ileal digestible energy and digestible nitrogen coefficient were lower in hens on the AM/PM treatment compared with the control treatment (both p < 0.001). However, the AM/PM treatment was attributed to a lower feed cost to egg mass compared with the control treatment (p < 0.001). In conclusion, using an AM/PM feeding strategy was found to be economically beneficial.

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Section: Discussionsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 93%

Effects of AM/PM Diets on Laying Performance, Egg Quality, and Nutrient Utilisation in Free-Range Laying Hens

Jahan,

Dao,

Morgan

et al. 2024

Applied Sciences

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“…Elevated platforms can make it easier for birds to escape aggressive behaviour and can be especially important for lowranking birds. Some systems separate the males from the females for parts of the day, which has been called the 'Quality time concept ' (van Emous, 2010). Genetic selection to reduce aggressiveness in males or breeding strategies that include selection in groups can also help reduce problems with social stress.…”

Section: Hazards and Preventive And Corrective Measuresmentioning

confidence: 99%

Welfare of broilers on farm

Nielsen¹,

Álvarez²,

Bicout³

et al. 2023

EFS2

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This Scientific Opinion considers the welfare of domestic fowl (Gallus gallus) related to the production of meat (broilers) and includes the keeping of day-old chicks, broiler breeders, and broiler chickens. Currently used husbandry systems in the EU are described. Overall, 19 highly relevant welfare consequences (WCs) were identified based on severity, duration and frequency of occurrence: 'bone lesions', 'cold stress', 'gastro-enteric disorders', 'group stress', 'handling stress', 'heat stress', 'isolation stress', 'inability to perform comfort behaviour', 'inability to perform exploratory or foraging behaviour', 'inability to avoid unwanted sexual behaviour', 'locomotory disorders', 'prolonged hunger', 'prolonged thirst', 'predation stress', 'restriction of movement', 'resting problems', 'sensory under-and overstimulation', 'soft tissue and integument damage' and 'umbilical disorders'. These WCs and their animal-based measures (ABMs) that can identify them are described in detail. A variety of hazards related to the different husbandry systems were identified as well as ABMs for assessing the different WCs. Measures to prevent or correct the hazards and/or mitigate each of the WCs are listed. Recommendations are provided on quantitative or qualitative criteria to answer specific questions on the welfare of broilers and related to genetic selection, temperature, feed and water restriction, use of cages, light, air quality and mutilations in breeders such as beak trimming, de-toeing and comb dubbing. In addition, minimal requirements (e.g. stocking density, group size, nests, provision of litter, perches and platforms, drinkers and feeders, of covered veranda and outdoor range) for an enclosure for keeping broiler chickens (fast-growing, slower-growing and broiler breeders) are recommended. Finally, 'total mortality', 'wounds', 'carcass condemnation' and 'footpad dermatitis' are proposed as indicators for monitoring at slaughter the welfare of broilers on-farm.

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“…The egg shape index was measured using a 0.01 mm digital caliper, calculated as the ratio of its height to diameter. The specific gravity of the eggs was determined using the egg floating method in a saltwater solution ( Van Emous, 2023 ).…”

Section: Methodsmentioning

confidence: 99%

Effects of replacing Na selenite in laying hen feed with selenized glucose on production performance, egg quality, egg selenium content, microbial population, immunological response, antioxidant enzymes, and fatty acid composition

Mohammadsadeghi,

Afsharmanesh,

Salarmoini

et al. 2024

Poultry Science

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Effects of feeding strategies during lay on broiler breeder production performance, eggshell quality, incubation traits, and behavior

Cited by 4 publications

References 35 publications

Effects of AM/PM Diets on Laying Performance, Egg Quality, and Nutrient Utilisation in Free-Range Laying Hens

Effects of AM/PM Diets on Laying Performance, Egg Quality, and Nutrient Utilisation in Free-Range Laying Hens

Welfare of broilers on farm

Effects of replacing Na selenite in laying hen feed with selenized glucose on production performance, egg quality, egg selenium content, microbial population, immunological response, antioxidant enzymes, and fatty acid composition

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