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Setting the right feeding program for your calves

Kathleen Shore Published on 07 June 2012

The Grober Young Animal Development Centre opened its doors in 2009 with the mission of uncovering and presenting best rearing practices for young animals. Over the past three years, approximately 300 calves, 40 lambs and 40 kid goats have resided at our Woodstock facility for the purpose of conducting nutritional and management research.

We have partnered with others from the industry (feed companies and producers) in order to ensure the research is applicable in today’s farming community.

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Automatic feeding machines for calves has been a part of the dairy management landscape for a number of years, facilitating the feeding of calves by reducing the chores of preparing and delivering milk replacer. Time spent in calf barns is now focused on management, cleaning and animal observation.

While the automatic feeding machine is an excellent tool, programming the feeding schedule is still a key part to the success of those calves.

In 2011, Grober evaluated two different feeding programs through the automatic feeding machine. We wanted to understand if allowing a calf to determine her own appetite through unlimited access to the milk feeder would be the right approach to feeding.

Bodyweight comparisons between treatment groups
Much academic research over the past 20 years has supported increased milk intake for optimal calf growth and their subsequent performance during first lactation. In 1968, researchers found that calves suckled on average 16 to 24 percent of their bodyweight, which would amount to 7.6 to 11.4 quarts per day for a 100-pound calf.

That range would indicate that different calves have different appetites – whether that variation was based on size, genetics or environment was not evaluated in that research.

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For the purpose of this trial, 38 calves were split into four groups, all fed by automatic feeding machines. One machine, which fed two groups, provided an unlimited amount of milk replacer throughout the day and the other machine limited calves to consuming 9.5 quarts per day.

All calves were allowed to drink between 2 and 3 quarts per visit to the machine. Calves receiving limited amounts of milk replacer were provided the following schedule: 6.3 quarts per day for the first five days, 9.5 quarts per day for the next 41 days and then weaned over 10 days (milk reduced from 9.5 to 2 quarts over the 10 days). The total time on milk replacer for both groups was 56 days.

Calves offered an unlimited daily consumption of milk replacer consumed 77.7 quarts (24.2 pounds) more milk replacer than the limited calves. Unlimited calves consumed on average 8.9 quarts per day and limited calves consumed, on average, 7.5 quarts per day.

Bodyweights were slightly higher in the unlimited groups from the start until weaning at week 8 (Figure 1 above right). Overall bodyweight gain was not different between groups (111 pounds for unlimited and 112 pounds for limited).

Starter intake comparisons between treatment groups
Starter intake was not different between groups until weaning time, when limited calves consumed more starter – 3.3 pounds day limited versus 2.4 pounds per day unlimited (Figure 2). There was no difference in health events – both groups had an average of three health events per calf.

When designing a feeding program using an automatic feeder, it would appear that limiting the amount of milk replacer to ensure calf needs (maintenance and growth) allows for increased grain intake and smoother transition at weaning while not compromising growth.

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Further work at the Grober Center will be done looking at providing unlimited milk to calves over the first few weeks and then gradually reducing milk intake over the next five weeks up to weaning.  PD

PHOTO
Automatic feeding machine.

Kathleen Shore

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