منابع مشابه
Sexing Day-Old Chicks on Small and Backyard Flocks
Vent sexing was developed in Japan and brought to North American poultry producers in the 1930s. Vent sexing is a skill that takes a long time to develop. It involves holding the chick upside down in one hand, expelling the fecal material, and everting (turning outward) the vent area. The producer can then look for the presence or absence of a rudimentary male sex organ. This process sounds muc...
متن کاملNormal Behaviors of Chickens in Small and Backyard Poultry Flocks
More recent research has primarily focused on the importance of different "normal" behaviors in relation to animal welfare in a commercial operation. Research indicates, for example, that laying performance of chickens is influenced by human interaction. Producers should walk through the laying house a couple of times per day, selecting times that fit into the flock's egg laying cycle, such as ...
متن کاملPoultry Genetics For Small and Backyard Flocks: An Introduction
DNA (short for deoxyribonucleic acid)—The material containing the genetic instructions used in development and function of an organism. DNA is arranged in double helix–shaped strands. Gene—A segment of DNA that carries a blueprint for the function of a cell and, ultimately, a particular characteristic of an organism. Chromosome—A structure containing a complete strand of DNA. Chromosomes functi...
متن کاملFocus Issue on Male Infertility
Male infertility problems can occur when sperms are limited in number or function. In this paper, we describe the clinical evaluation of male infertility. A detailed history, physical examination, and basic semen analysis are required. In addition, ultrasound, karyotyping, and hormonal studies are needed to determine specific causes of infertility. In addition, the World Health Organization (WH...
متن کاملExternal Anatomy of Poultry Kept on Small or Backyard Flocks: Duck
Ducks have many of the same basic external parts as other fowl, such as chickens. However, some unique characteristics exist in the external anatomies of ducks. For example, a duck's head (shown in Figure 1) differs from a chicken's head in several ways. Ducks have no comb and, other than the crested duck, no head covering other than feathers. The bill of a duck is flatter than the beak of a ch...
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ژورنال
عنوان ژورنال: Journal of Veterinary Diagnostic Investigation
سال: 2019
ISSN: 1040-6387,1943-4936
DOI: 10.1177/1040638719846879