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Light Management in Breeder: know more…

Published: January 14, 2019
By: Dr. Pooja Gautam, Product Manager, Natural Remedies Pvt Ltd
KEY POINTS
  • Birds ‘reproductive cycle is controlled by changes in day length called as Photoperiod.
  • Birds perceive this photoperiod in two ways:
  • a) Through retinal of the eye to visual cortex and pituitary gland
  • b) Through harderian gland (UVA specific light) which triggers reproductive system
  • Birds are not “stimulated” by the entire period of light, but rather by two important parts of this period. Birds are sensitive to the time of initial “Light-on“and subsequently during a period 11-13 hour later which is called the “Photosensitive Phase”.
  • There are two type houses: a) Open-sided breeder houses (most common) and b) Dark-out breeder houses
  • In open house system birds are subjected to three different light phases - namely light, dark and brown-out due to excessive light leakage through ventilation system.
  • Brown-out is acceptable, if it is not greater than 10x the intensity of any true black-out period. If intensity of brown-out is more than it causes decline in production.
  • In dark-out breeder houses; Biomitten program and Ahemeral cycle program has been followed.
  • Minimum stimulatory day length is around 12 hours
  • The intensity of the light period is always at least 10x greater than the intensity of the dark period.
  • The natural pattern of light: darkness varies depending upon latitude, season and pollution.
  • A thumb rule with breeders is to ensure hens are at least 2.1kg and 20 weeks of age before light stimulation.
  • Over time, breeders become photorefractory to light, meaning that the endocrine system becomes less active, and output of gonadotrophins from the Many indigenous herbs proven to improve egg production and semen quality in aged flock by stimulating the hypothalamic-pituitary axis. Egmax & Hatch Up from Natural Remedies Pvt Ltd are proven for abnormal production loss due to geriatric phenomenon.
Most birds are seasonal breeders and their reproductive cycle is controlled by changes in day length called as Photoperiod. Through its effect on the hypothalamus, light is responsible for the control over gonadotropin releasing hormone production by pituitary, and this is ultimately responsible for control of ovulation in the hen and spermatogenesis in the rooster.
Circadian Clock & Reproduction Cycle
Birds perceives this photoperiod in two ways:
1) The retina of a bird's eye can perceive a great variety of information about the intensity,  colours, and direction of light. The information is transmitted to two different areas - to the part of the brain responsible for vision (visual cortex) and to the pituitary gland.
2) UVA is the specific type of light that the Harderian Gland senses. This is one of the triggers for reproductive system. There is a special tissue that surrounds parts of the avian eye socket called the Harderian Gland. It can sense the photoperiod. The below diagram is showing how the normal circadian clock triggers for reproduction and migratory behaviour.
Light Management in Breeder: know more… - Image 1
Birds are not “stimulated” by the entire period of light, but rather by two important parts of this period. Birds are sensitive to the time of initial “Light-on “and subsequently during a period 11-13 hour later which is called the “Photosensitive Phase”.
Light Management in Breeder: know more… - Image 2
A short day is not stimulatory, whereas a long day initiates or maintains the cascade of hormonal release that control ovulation or spermatogenesis. For practical purposes, the minimum stimulatory day length is around 12 hours, and there is little benefit to going much beyond 16-17h total light.
Seasonal Effects on Light Stimulation and Egg Production
The natural pattern of light: darkness varies depending upon latitude, season and pollution. The daylength at “maturity” will be dictated by the season of the year. Studied conducted by Lopez & Leeson (1992) revealed, as latitude increases the variation in the maturity and % peak production is noticeable at same managemental conditions.
Light Management in Breeder: know more… - Image 3
Effect of Light Stimulation & Body weight on Reproductive performance
There is a correlation between mature weight and age at maturity. Underweight pullets should not be light stimulated until the standard weight (around 2.0kg) is achieved, regardless of age. A useful thumb rule with breeders is to ensure hens are at least 2.1kg and 20 weeks of age before light stimulation.
Light Management in Breeder: know more… - Image 4
Both pullets and cockerels will be grown on continuous light for 2-3 days, and then day length reduced to 8-12h of constant light, up to 20 weeks of age. During this stage, shorter the daylength, the greater the saving in feed cost, because birds are less active and spend more time in darkness.
Age Related complications in Light Stimulation
Poor breeder performance will always result from an ill-designed or implemented light program, while a good lighting program is merely part of an overall management strategy. Over time, breeders become photorefractory to light, meaning that the endocrine system becomes less active, and output of gonadotrophins from the pituitary decline. It is known as geriatric phenomenon.
Quest for Natural Alternative Therapies for Breeders
Many indigenous herbs proven to improve egg production and semen quality in aged flock by stimulating the hypothalamic-pituitary axis. Natural Remedies Pvt Ltd is providing such solution in convenient manner through their product like Egmax for optimizing the female productivity and Hatch-Up a natural male breeding efficiency optimizer. Improvement in post peak egg production by Egmax in female breeder is validated by many commercial trials. While Hatch Up is accepted as the herbal therapeutics for improving libido, semen volume, sperm concentration and minimizing the defective spermatozoa.
Light Management in Breeder: know more… - Image 5
Light Management in Breeder: know more… - Image 6
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Dr Pooja Bhardwaj
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Dr. Vinayak Surve
24 de abril de 2019
Detailed and informative article. One can get good insights on light management by revisiting the ideas mentioned in the article. Thanks Dr. Pooja for reviewing many articles and bringing the best insights together in this article.
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Roberto Ricagno
8 de febrero de 2019

Dr. Robert Renema, thank you very much for your comment.
I totally agree with your initial assessment and even more, how well you, Dr. Robinson and other researchers at your University have published several times, in this stage of the photostimulus, we're doing an ovarian management where the feeding must be very tight and especially post photostimulation to avoid deaths associated with ovarian overstimulation.

For this reason, feed increases are conservative after photostimulus. And it is what I do in the management of parental flocks with my advisors to avoid mortality, considering that in full peak 0.25 / 0.30% weekly mortality would be the most I want to have.

My apologies but I do not finish to understand what you are referring to with your phrase .... I'm not saying increase feed, but instead I'm rethinking the size and timing of your feed increases (especially in uniform flocks!) .... Could you expand on that comment or send me information on where to read it more widely?

Thank you very much.

Roberto Ricagno

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Roberto Ricagno
8 de febrero de 2019

Dra Pooja Gautam, excellent article and also your contribution on LED lights and CLF.

Thanks for sharing.

I would like to consult you for an observation exposed in it.

I do not completely agree with the observation "A thumb rule with breeders is to ensure hens at least 2.1kg and 20 weeks of age before light stimulation", at least for certain genetic lines and for these last years and that is why I wanted see if I could give more information about it.

This data, correct, real and practical of the 90s can be referred to the practical experience and research of a few years ago, expressed by several researchers, as cited by Robinson, 1996, and also by many works of Dr. Lien regarding of photostimulation by age or weight and the realization among them.

Although I do not see it compatible today with certain genetic lines (example Cobb 500 SF) where the conditions to photostimulate a bird are closer to a weight of 2.4 kg and in age closer to 144-147 days and additional to it to a certain conformation of fleshing and fat reserves.
Being the latter one of the most difficult aspects to achieve with the genetic advance because the birds increasingly tend to deposit less fat (meat more lean) which complicates those who work with breeders.

Today we look for peaks of production closer to 88-90% and about 10-11 weeks over 80%, much higher than what was expressed in articles of the '90s.

Do you consider that the concept of 2.1 kg and 20 weeks should be reviewed at least for certain lines?

Greetings and many thanks.

Roberto Ricagno

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Robert Serwanga
Agrarian Systems
25 de febrero de 2019
Thank you Robert and Robert for the insight.
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Robert Huggins
21 de febrero de 2019
The simple answer to your question is yes. However, with broilers, it is more normal to have chicks placed as straight run where males and females are reared together. This can pose some problems if you are very particular about feed type and management and age at which the birds are "pulled" for sale. The second way broilers are raised, male and female chicks are separated at the hatchery and placed into separate barns on the farm. This allows the producer to pull one set of birds without stressing the other thereby allowing for normal growth. As far as layers go, birds can be separated into small, medium and large after weighing as is done with breeders. Again, this will depend on size of flock and type of system used. For cage layers, it starts when the chicks are put into the cages at the time of placement, or after the chicks have gone through starter stage when the pullets are being separated. If the birds are free run then use the same system as for breeders.
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Robert Serwanga
Agrarian Systems
21 de febrero de 2019

This is very useful information for efficient breeder management.
My question is can this separation in three sizes i.e small, medium and big also benefit those in commercial production egg and meat?

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Siddiqur Rahman
21 de febrero de 2019
Yes, you are right.
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odunewu adebayo
14 de febrero de 2019
This is educating and informative. Kudos, Dr. Pooja
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Robert Huggins
12 de febrero de 2019

I agree this is not always possible especially when the flocks are large. However, in developing countries broiler breeder producers may not be as large as those found in North America so dividing the barn and sorting of birds into small, medium and large birds with a small area for males is not difficult. When we started this program the farm was raising 15,000 broiler breeders, but divided between 5 barns of 3,000 birds per barn, so was feasible. We also used automatic feeders, but added a dummy hopper. The other alternative which would be nice is getting the hatcheries to separate the chicks into the three sizes by weight.

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Robert Huggins
9 de febrero de 2019

While I agree with what Dr. Renema is saying, my experience with broiler breeders, at least under tropical conditions was to divide the barn into 4 and separate the baby chicks as much as possible into small, medium and large chicks, with the 4th section reserved for extra males. We found prior to doing this, no matter what we did. When chicks were weighed weekly, underweight chicks were placed into the section with small birds and overweight into the section with large birds. Prior to doing this we always had poor uniformity.

Once we were able to successfully separate the chicks by weight; uniformity improved and mortality decreased. As far as feeding went, this was adjusted weekly and depending on how much I wanted the birds to be over under the standard weight determined whether feed was increased the next week or remained the same. This worked very well for our program which resulted in higher production rates and better quality chicks.

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