Confirmation of Galactopoitic Effects of Photoperiod
Photoperiod Map

Summary of studies on the response of lactating cows to supplemental lighting

Study Author Location (Latitude) Milk Yield
(lbs/day)		 Responses Fat % Feed Intake Reference
Peters et al. Michigan
(42o N)		 4.4up_arrow-smaller.gif (870 bytes)  No change --- 1
Peters et al. Michigan
(42o N)		 3.1up_arrow-smaller.gif (870 bytes) No change Tendencyup_arrow-smaller.gif (870 bytes) 2
Marcek and Swanson Oregon
(45o N)		 4.0up_arrow-smaller.gif (870 bytes) --- --- 3
Stanisiewski et al. Michigan
(42o N)		 4.9up_arrow-smaller.gif (870 bytes) 0.16%down_arrow-smaller.gif (872 bytes) --- 4
Bilodeau
et al.		 Quebec
(47o N)		 4.4up_arrow-smaller.gif (870 bytes) No change 4%up_arrow-smaller.gif (870 bytes) 5
Evans and Hacker Ontario
(43o N)		 6.2up_arrow-smaller.gif (870 bytes) No change No change 6
Phillips and Schofield Wales
(53o N)		 7.3up_arrow-smaller.gif (870 bytes) No change Tendencyup_arrow-smaller.gif (870 bytes) 7
Dahl et al. Maryland
(39o N)		 4.9up_arrow-smaller.gif (870 bytes) No change No change 8
Miller et al. Maryland
(39o N)		 4.2up_arrow-smaller.gif (870 bytes) No change 3.5%up_arrow-smaller.gif (870 bytes) 9
Reksen et al. Norway
(60-62o N)		 1.1up_arrow-smaller.gif (870 bytes) --- --- 10

 

1.  Peters, R. R. , L. T. Chapin, K. B.Leining, and H. A. Tucker.  1978.  Supplemental lighting stimulates growth and lactation in cattle.  Science 199:911-912.

2.  Peters, R. R. , L. T. Chapin, R. S. Emery, and H. A. Tucker.  1981.  Milk yield, feed intake, prolactin, growth hormone, and glucocorticoid response of cows to supplemental light.  Journal of Dairy Science 64:1671-1678.

3.  Marcek, J. M. and L. V. Swanson.   1984.  Effect of photoperiod on milk production and prolactin of Holstein dairy cows.  Journal of Dairy Science 67:2380-2388.

4.  Stanisiewski, E. P., R. W. Mellenberger, C. R. Anderson, and H. A. Tucker.  1985.  Effect of photoperiod on milk yield and milk fat in commercial dairy herds.  Journal of Dairy Science 68:1134-1140.

5.  Bilodeau, P. P., D. Petitclerc, N. St. Pierre, G. Pelletier, and G. J. St. Laurent.  1989.  Effects of photoperiod and pair-feeding on lactation of cows fed corn or barley grain in total mixed rations.  Journal of Dairy Science 72:2999-3005.

6.  Evans, N. M. and R. R. Hacker.   1989.  Effect of chronobiological manipulation of lactation in the dairy cow.  Journal of Dairy Science 72:2921-2927.

7.  Phillips, C. J. C. and S. A. Schofield.  1989.  The effect of supplementary light on the production and behavior of dairy cows.  Animal Production 48:293-303.

8.  Dahl, G. E., T. H. Elsasser, A. V. Capuco, R. A. Erdman, and R. R. Peters.  1997.  Effects of long day photoperiod on milk yield and circulating insulin-like growth factor-1.  Journal of Dairy Science 80:2784-2789.

9.  Miller, A. R. E., E. P. Stanisiewski, R. A. Erdman, L. W. Douglass, and G. E. Dahl.  1999.  Effects of long daily photoperiod and bovine somatotropin (Trobest ®) on milk yield in cows.  Journal of Dairy Science 82:1716-1722.

10.  Reksen, O., A. Tverdal, K. Landsverk, E. Kommisrud, K. E. Bøe, and E. Ropstad.  1999.  Effects of photointensity and photoperiod on milk yield and reproductive performance of Norwegian red cattle.  Journal of Dairy Science 82:810-816.

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