Mariposa Ranch is located in Newman, CA and produces beef owned by Seth and Mica Nitschke. Seth and Mica are looking for a bull to breed their young heifers and small cows. They do not want their cattle to give birth to large calves (anything over 90 lbs.) because a large birthweight may cause serious problems for the cow and calf. Seth and Mica plan to sell their calves in the fall after they have weaned them from their mothers. Typically, their calves weigh between 600- 700 lbs. at weaning. They are paid for their calves by the pound, so they strive to raise calves with a high weaning weight. Which bull would best fit their needs? BW=birthweight wW=weaning weight O BW: 80 Ibs. wW: 790 Ibs. O BW: 77 Ibs. WW: 700 lbs. O BW: 105 Ibs. WW: 810 lbs. O BW: 70 Ibs. wW: 650 lbs.

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**Birthweight and Weaning Weight Background Information**

In beef production, the birthweight of calves is often taken into consideration when selecting breeding bulls. Calves with very high birthweights (>90 pounds) can cause problems for young heifers (cattle who have never given birth before) and small cows. If the calf is too big, this causes problems during birth for the cow and calf, which can lead to serious complications or death.

Detailed records are kept on bulls and the average birthweight of a bull’s offspring can be predicted based on the bull’s genetics. In beef production, many producers sell their calves in the fall after they have been weaned. This means they no longer receive milk from their mothers. Typically, calves weigh about 600-700 pounds at weaning.

Beef producers are paid by the pound, so a high weaning weight is a desirable trait sought after when breeding cattle. ($1.50 per lb. for a 600 lb. calf = ?) Birthweights and weaning weights are both considered highly heritable traits.

*Image Description*: The image shows a field with several cows grazing. A mountain range can be seen in the background under a mostly clear sky.

Mariposa Ranch is located in Newman, CA and produces beef owned by Seth and Mica Nitschke. Seth and Mica are looking for a bull to breed their young heifers and small cows. They do not want their cattle to give birth to large calves (anything over 90 lbs.) because a large birthweight may cause serious problems for the cow and calf. Seth and Mica plan to sell their calves in the fall after they have weaned them from their mothers. Typically, their calves weigh between 600-700 lbs. at weaning. They are paid for their calves by the pound, so they strive to raise calves with a high weaning weight. Which bull would best fit their needs?

BW = birthweight  
WW = weaning weight

- BW: 80 lbs. WW: 790 lbs.
- BW: 77 lbs. WW: 700 lbs.
- BW: 105 lbs. WW: 810 lbs.
- BW: 70 lbs. WW: 650 lbs.
Transcribed Image Text:**Birthweight and Weaning Weight Background Information** In beef production, the birthweight of calves is often taken into consideration when selecting breeding bulls. Calves with very high birthweights (>90 pounds) can cause problems for young heifers (cattle who have never given birth before) and small cows. If the calf is too big, this causes problems during birth for the cow and calf, which can lead to serious complications or death. Detailed records are kept on bulls and the average birthweight of a bull’s offspring can be predicted based on the bull’s genetics. In beef production, many producers sell their calves in the fall after they have been weaned. This means they no longer receive milk from their mothers. Typically, calves weigh about 600-700 pounds at weaning. Beef producers are paid by the pound, so a high weaning weight is a desirable trait sought after when breeding cattle. ($1.50 per lb. for a 600 lb. calf = ?) Birthweights and weaning weights are both considered highly heritable traits. *Image Description*: The image shows a field with several cows grazing. A mountain range can be seen in the background under a mostly clear sky. Mariposa Ranch is located in Newman, CA and produces beef owned by Seth and Mica Nitschke. Seth and Mica are looking for a bull to breed their young heifers and small cows. They do not want their cattle to give birth to large calves (anything over 90 lbs.) because a large birthweight may cause serious problems for the cow and calf. Seth and Mica plan to sell their calves in the fall after they have weaned them from their mothers. Typically, their calves weigh between 600-700 lbs. at weaning. They are paid for their calves by the pound, so they strive to raise calves with a high weaning weight. Which bull would best fit their needs? BW = birthweight WW = weaning weight - BW: 80 lbs. WW: 790 lbs. - BW: 77 lbs. WW: 700 lbs. - BW: 105 lbs. WW: 810 lbs. - BW: 70 lbs. WW: 650 lbs.
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