Forced traffic in automatic milking systems effectively reduces the need to get cows, but alters eating behavior and does not improve milk yield of dairy cattle.

Eighty-five lactating Holstein dairy cows in loose housing conditions in 2 symmetrical pens, each containing 28 feeding places, 3 waterers, and 1 automatic milking system (AMS), were used to evaluate the effects of the traffic type imposed on lactating cows through an AMS on milking frequency, feeding behavior, and milk production. The study was a crossover design with 2 periods and 2 treatments. Each period lasted 3 mo, with 1 mo of adaptation within each period. All cows were fed a partial mixed ration twice daily and up to 3 kg/d of a concentrate during the visits to the AMS. Treatments consisted of allowing free traffic of cows throughout the pen or forcing cows to pass through the AMS to access the feed troughs (forced traffic). Individual eating behavior and feed consumption were continuously monitored throughout the study using a computerized system. Individual milk production was recorded at each milking, and milk composition was recorded monthly. In addition, the number of cows brought to the AMS was recorded. The number of daily meals was less, whereas meal duration and meal size were greater with forced traffic (6.6 +/- 0.3 meals/d, 20.4 +/- 0.65 min/meal, and 2.7 +/- 0.09 kg/meal, respectively) than with free traffic (10.1 +/- 0.3 meals/d, 15.7 +/- 0.65 min/meal, and 1.8 +/- 0.09 kg/meal, respectively). Total dry matter intake (21.1 +/- 0.5 and 20.4 +/- 0.58 kg/d, respectively) and milk production (29.8 +/- 0.79 and 30.9 +/- 0.79 kg/d, respectively) were similar in the 2 systems. The number of voluntary and total daily milkings was greater with forced traffic (2.4 +/- 0.04 and 2.5 +/- 0.06 milkings/d, respectively) than with free traffic (1.7 +/- 0.06 and 2.2 +/- 0.04 milkings/d, respectively). Forced traffic improved the number of voluntary milkings, but altered milk quality and eating behavior of dairy cattle.

[1]  A. H. Ipema,et al.  The effect of two traffic situations on the behavior and performance of cows in an automatic milking system. , 2003, Journal of dairy science.

[2]  M. Kreuzer,et al.  Effect of water restriction on feeding and metabolism in dairy cows. , 2001, American journal of physiology. Regulatory, integrative and comparative physiology.

[3]  Sophia Rabe-Hesketh,et al.  Multilevel and Longitudinal Modeling Using Stata , 2005 .

[4]  D. Mertens.  Creating a system for meeting the fiber requirements of dairy cows. , 1997, Journal of dairy science.

[5]  M. R. Stokes,et al.  Eating and resting salivation in early lactation dairy cows. , 1986, Journal of dairy science.

[6]  H. Wiktorsson,et al.  The effects of restricted feed access and social rank on feeding behavior, ruminating and intake for cows managed in automated milking systems , 2007 .

[7]  M. Sinclair,et al.  Barn layout and cow traffic to optimise the capacity of an automatic milking system. , 2002 .

[8]  K. Svennersten-Sjaunja,et al.  Feeding patterns and performance of cows in controlled cow traffic in automatic milking systems. , 2005, Journal of dairy science.

[9]  P. Utley,et al.  Effect of restricted water intake on feed intake, nutrient digestibility and nitrogen metabolism in steers. , 1970, Journal of animal science.

[10]  A Bach,et al.  Technical note: a computerized system for monitoring feeding behavior and individual feed intake of dairy cattle. , 2004, Journal of dairy science.

[11]  R. W. Palmer,et al.  Feeding behavior, milking behavior, and milk yields of cows milked in a parlor versus an automatic milking system. , 2003, Journal of dairy science.

[12]  I. Halachmi,et al.  Comparing two concentrate allowances in an automatic milking system , 2005 .

[13]  K. Uetake,et al.  Behavioral pattern of dairy cows milked in a two-stall automatic milking system with a holding area. , 1997, Journal of animal science.

[14]  A. Bach,et al.  Effects on milk yield of milking interval regularity and teat cup attachment failures with robotic milking systems , 2005, Journal of Dairy Research.

[15]  A. H. Ipema,et al.  Mogelijkheden om het koeverkeer te beinvloeden ten behoeve van het automatisch melken = Influencing cow traffic for the purpose of automatic milking , 1993 .

[16]  Stefanowska,et al.  The effect of omitted milking on the behaviour of cows in the context of cluster attachment failure during automatic milking. , 2000, Applied animal behaviour science.

[17]  K. Svennersten-Sjaunja,et al.  Pros and cons of automatic milking in Europe. , 2008, Journal of animal science.

[18]  C. C. Ketelaar-de Lauwere,et al.  Behaviour of dairy cows under free or forced cow traffic in a simulated automatic milking system environment. , 1998 .

[19]  A. Bach,et al.  Performance and feeding behavior of primiparous cows loose housed alone or together with multiparous cows. , 2006, Journal of dairy science.

[20]  S. Calsamiglia,et al.  Effect of amount of concentrate offered in automatic milking systems on milking frequency, feeding behavior, and milk production of dairy cattle consuming high amounts of corn silage. , 2007, Journal of dairy science.