Written by : Dr. Jacquie Jacob, University of Kentucky. Figure 1. Genetic basis for sex determination in mammals and birds Image created by Dr. With most animals, it is relatively easy to determine the sex of the newborn. The male reproductive organs are located on the outside of the body and are relatively easy to see, even in newborns. This is not the case with poultry. In male birds, the reproductive organs are inside the body cavity. This makes sexing newly hatched chicks difficult There are two methods of sexing chicks that can be used at hatcheries: vent sexing and feather sexing.
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Determining the Sex of Your Tortoise. Because of the differences in the ways that different species can be sexed, we wanted to put together a page showing many different species, and the things to look for when sexing a particular species. We often hear "males have a concave stomach" or things like "males have longer tails," both of which are generally true, but do not apply in some species. Here are species-specific photos and things to look for that will hopefully help you determine what sex you have. Sexing elongated tortoises is most quickly done by comparing the tail length of animals to each other.
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Chick sexing is the method of distinguishing the sex of chickens and other hatchlings, usually by a trained person called a chick sexer or chicken sexer. The females and a limited number of males kept for meat production are then put on different feeding programs appropriate for their commercial roles. Different segments of the poultry industry sex chickens for various reasons. In farms that produce eggs, males are unwanted; for meat production, separate male and female lines for breeding are maintained to produce the hybrid birds that are sold for the table, and chicks of the wrong sex in either line are unwanted. Chicks of an unwanted sex are killed almost immediately to reduce costs to the breeder. Several methods are used to determine the sex of a day-old chick. Some are effective only with certain breeds or crosses, while others are universal. The two chief methods of sexing chicks are feather sexing and vent sexing.