Broiler Breeder Production by S Leeson, J D Summers

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By S Leeson, J D Summers

A complete overview of all points of business creation platforms, this publication presents an updated examine broiler breeder creation and administration. beginning with really expert genetic courses as built by way of the first breeders and finishing with chapters on functional, hands-on features of breeder administration, the source comprises vast assurance of well-being administration, feeding platforms, environmental keep watch over, lights courses, and female and male replica. spotting the range of administration structures around the globe, it comprises breeders in either temperate and hot climates in addition to managed atmosphere as opposed to curtain-sided housing structures.

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With open-sided pullet growing facilities, the lighting program has to be flexible, commensurate with seasonal changes in day length. The goal is to have constant daylength, at least from 10-20 weeks of age, and not to expose birds to step-up daylength at any time prior to 21 weeks or whatever age that first light stimulation is usually given. 3 shows 3 scenarios for breeder flocks hatched in January, April, or June, again at 20o latitude. 15 D With continuous step-down light up to maturity, June hatched birds will mature very late.

Infertile eggs retain the original yolk color, and are little different in appearance compared to fresh eggs. The germinal disc is still quite distinct and small. With embryos dying very young, the germinal disc will be larger in diameter and there will not be a distinct raised disc per se. The yolk is often paler in color and sometimes has a mottled appearance. When candling at 7d, the total number of viable embryos, expressed as a percentage of all eggs examined, is often referred to as candling fertility.

With increase in latitude, north or south, then the pattern of light:dark fluctuates throughout the year. At 10o latitude, day length varies by only about 1 hour comparing the longest vs shortest day. However, at 20o, 30o and 40o latitude the differences are about 2,4 and 6h respectively. The higher the latitude, then the greater the potential advantage of using some type of artificial lighting program especially for control over sexual maturity. For example in the N. hemisphere at 30o latitude, January hatched breeders can be expected to mature much earlier than June hatched breeders exposed to natural lighting, because the January hatched chicks will be grown on an increasing light program 54 Lighting until the time of expected maturity.

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