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Agricultural News


Glenn Selk on Growing Bred Replacement Heifers

Tue, 04 Aug 2020 07:20:45 CDT

Glenn Selk on Growing Bred Replacement Heifers Bred replacement heifers that will calve in late January and February need to continue to grow and maintain body condition. Ideally, two year old heifers should be in a body condition score 6 at the time that their first calf is born.    See example of a two-year-old in body condition score 6 below.

This allows them the best opportunity to provide adequate colostrum to the baby, repair the reproductive tract, return to heat cycles, rebreed on time for next year, and continue normal body growth. From now until calving time, the heifers will need to be gaining 1 to 1 1/2 pounds per head per day, assuming that they are in good body condition coming out of summer.

Pregnant replacement heifers will need supplemental protein, if the major source of forage in the diet is bermudagrass or native pasture or grass hay. If the forage source is adequate in quantity and average in quality (6 - 9% crude protein), heifers will need about 2 to 2.5 pounds of a high protein (38 - 44% CP) supplement each day. This will probably need to be increased with higher quality hay (such as alfalfa) or additional energy feed (20% range cubes) as winter weather adds additional nutrient requirements.   For more details about the nutrient needs of all classes of beef cattle download and read Oklahoma State University Extension Circular E-974 “Nutrient Requirements of Beef Cattle”.

Wheat pasture (if adequate rainfall produces growth) can be used as a supplement for pregnant replacement heifers. Using wheat pasture judiciously makes sense for pregnant heifers for two reasons. Pregnant heifers consuming full feed of wheat pasture will gain at about 3 pounds per head per day. If they are on the wheat too long the heifers can become very fat and may cause dystocia (calving difficulty). Also the wheat pasture can be used for gain of stocker cattle or weaned replacement heifers more efficiently. If wheat pasture is used for bred heifers, use it as a protein supplement by allowing the heifers access to the wheat pasture on at least alternate days. Some producers report that 1 day on wheat pasture and two days on native or bermuda will work better. This encourages the heifers to go rustle in the warm season pasture for the second day, rather than just stand by the gate waiting to be turned back in to the wheat. Whatever method is used to grow the pregnant replacement heifers, plan to have them in good body condition (BCS=6) by calving so that they will grow into fully-developed productive cows.


   

 

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