31/08/2020
๐ฃ๐ฟ๐ฒ๐ด๐ป๐ฎ๐ป๐ฐ๐ ๐ง๐ฒ๐๐๐ถ๐ป๐ด ๐ถ๐ป ๐๐ฎ๐๐๐น๐ฒ
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Pregnancy detection is a way to identify nonpregnant cows and, subsequently, decide how to best manage nonpregnant animals on your operation. Pregnancy determination is made by three main methods: palpation per re**um, transrectal ultrasonography and blood analysis (Biochemical Tests) for pregnancyspecific proteins.
per Rectum=> Palpation per re**um (palpation) is the most common method of pregnancy detection used on beef cattle operations. Using palpation is not a visual process; the veterinarian comes out, puts on a sleeve and goes in and out of the cows, and we may be left wondering what just happened. Depending on the age of the pregnancy, several different things could have happened during the process. The placenta of a calf has two distinct layers: a fused chorion/allantois and the amnion. The technique used to detect most early pregnancies with palpation is to feel the โfetal membrane slip.โ In a pregnant female, the layers of the placenta will be felt slipping between your fingers when the uterus is gently pinched. The fetal membrane slip can be felt in pregnant cows beginning from day 35 to 45 after breeding, depending on the person performing the technique. As pregnancies progress, the developing fetus also can be felt. When learning how to age pregnancies with palpation per re**um, students are taught to associate pregnancies of a given age with animals they are familiar with: 2 months = mouse, 3 months = rat, 4 months = small cat, 5 month = large cat, 6 months = beagle. In addition to the size of the fetus, the size of the placentomes can be felt to give an indication of fetal age beginning around 90 days after breeding. Placentomes are the points where the placenta attached to the uterus to share nutrients between the cow and calf. Half of this structure, the cotyledons, can be seen as the โbuttonsโ on the afterbirth that passes shortly after calving. You should not see the other half, the caruncles, which would be visible as โbuttonsโ on a pr*****ed uterus!
By; Carl Dahlen, North Dakota State University
