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Agricultural News


Three Ways to Sort Your Cattle to Increase Your Herd's Supplemental Feed Efficiency this Winter

Wed, 06 Sep 2017 12:01:35 CDT

Three Ways to Sort Your Cattle to Increase Your Herd's Supplemental Feed Efficiency this Winter Dr. Glenn Selk, Oklahoma State University Emeritus Extension Animal Scientist, offers herd health advice as part of the weekly series known as the "Cow/Calf Corner" published electronically by Dr. Peel and Dr. Glenn Selk. Today, Dr. Selk describes how producers can increase the efficiency of their supplemental winter feeding by sorting their cattle.



"Planning now for winter feeding can provide an opportunity to become more efficient in the use of our winter feed dollars. Thoughtful sorting of the cow herd during the fall months as the summer grasses become dormant, allows the cows to be supplemented through the winter according to their needs.



"First calf heifers have historically been the toughest females on the ranch to get rebred. They are being asked to continue to grow, produce milk, repair the reproductive tract, and have enough stored body energy (fat) to return to heat cycles in a short time frame. Two-year old cows must fill all of these energy demands at a time when their mouth is going through the transition from baby teeth to adult teeth.   



"If these young cows are pastured with the larger, older cows in the herd, they very likely will be pushed aside when the supplements are being fed in the bunk or on the ground. The result of these adverse conditions for young cows very often is a lack of feed intake and lowered body condition. Of course, lowered body condition in turn results in delayed return to heat cycles and a later calf crop or smaller calf crop the following year.



"North Dakota State University data of commercial cow herds recorded over a 21 year period illustrated the differences in size and body condition of very young cows and the very mature (10 year old+) cows. The North Dakota data clearly show that the average 2 year old is about 20% smaller than her full grown herd mates. There is little wonder that the younger cows get pushed away from feed bunks, hay racks, or supplements fed on the ground. The results of the size differences and the need to continue to grow are manifest in the lower body condition scores noted in the very young cows. The very old cows are experiencing decline in dental soundness that make it difficult for them to maintain feed intake and therefore body condition. Over the 21 year data set from North Dakota, the 2-year old cows and the 11 year-old and older were significantly lower (0.3 or more units) in body condition score than middle-age cows.



"Consequently, it makes sense to sort very young cows with the very old cows and provide them with a better opportunity to compete for the feed supplies. By doing so, the rancher can improve the re-breeding percentages in the young cows and keep the very old cows from becoming too thin before culling time.



"From this data they formulated three logical groups of cows to be pastured together for feeding efficiency:



"Group 1: The two-year old first calf heifers. They have higher nutrient needs than other cows that are not growing. They are too small to compete with larger, older, boss cows for the supplement. Some second-calf three year olds that are low in body condition also may fall into this group.



"Group 2: The old cows (10 years and older) and the 2nd calf heifers. In addition, this group should include any of the middle aged cows that were thin and needed extra supplement. Cows that were Body Condition Score 4 or less would be considered.



"Group 3: The remaining cow herd. This is the group that is mature in size and in adequate condition to enter the winter feeding period as at least Body Condition Score 5.



Many small beef herds may not have the pastures available to sort the cows into three groups. If only two groups are possible, putting groups 1 and 2 together would be the logical other combination.



"Ranchers, then want to be certain that the feeding program is adequate to have cows in each group calve as BCS 5 or 6 next spring."




   

 

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