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Article| Volume 84, ISSUE 3, P600-608, March 2001

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The Effect of Extended Calving Intervals in High Lactating Cows on Milk Production and Profitability

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      Abstract

      A field trial was conducted to examine the effect of extended calving interval (CI) on production and profitability of high yielding cows (n = 937). First insemination was performed at 154 and 93 d postpartum (pp), for treatment and control primiparous cows, respectively, and at 124 and 71 d pp for treatment and control multiparous cows, respectively. During the first experimental lactation, average daily value-corrected milk (VCM) yield was 28.5 and 27.7 kg/d of CI for treatment (n = 131) and control (n = 133) primiparous cows, respectively. No significant difference in average daily VCM yield (33.0 and 32.8 kg/d of CI) was found between treatment (n = 271) and control (n = 215) multiparous cows. In the first 150 d of the subsequent lactation, there were significant differences in milk and VCM production in favor of the treatment primiparous cows (41.4 vs. 39.7 kg of VCM/d) but no significant differences in the production of multiparous cows. Primiparous and multiparous cows with extended lactations were more profitable. During the first experimental lactation, there were advantages of $0.19 and $0.12/d of CI in the net returns for primiparous cows and multiparous cows with longer CI, respectively. When the economic analysis included the first experimental lactation plus the first 150 d of the subsequent one, the net return per day of CI was higher for cows with an extended voluntary waiting period: $0.21/d and $0.16/d for primiparous and multiparous cows, respectively. A delay of 60 d with respect to the usual voluntary waiting period in the beginning of inseminations of high yielding cows has economic advantages and allows the farmer an optionfor decisions regarding individual cows.

      Key words

      Abbreviation Key:

      CI (calving interval), DO (days open), pp (postpartum), VCM (value-corrected milk), VWP (voluntary waiting period)

      References

        • Bar-Anan R.
        • Soller M.
        The effect of days open on milk yield and on breeding policy post partum.
        Anim. Prod. 1979; 29: 109-119
        • Bertilsson J.
        • Berglund B.
        • Ratnayake G.
        • Svennersten-Sjaunja K.
        • Wiktorsson H.
        Optimising lactation cycles for the high-yielding dairy cow. A European perspective.
        Livest. Prod. Sci. 1997; 50: 5-13
        • Dijkhuizen A.A.
        • Stelwagen J.
        • Renkema J.A.
        Economic aspects of reproductive failure in dairy cattle. I. Financial loss at farm level.
        Prev. Vet. Med. 1985; 3: 251-263
        • Funk D.A.
        • Freeman A.E.
        • Berger P.J.
        Effects of previous days open, previous days dry, and present days open on lactation yield.
        J. Dairy Sci. 1987; 70: 2366-2373
      1. Galton, D. M. 1997. Extended calving intervals, BST may be profitable. Feedstuffs (13/10/97) pp. 11-13.

        • Genizi A.
        • Schindler H.
        • Amir S.
        • Eger S.
        • Zarchi M.
        • Foote R.H.
        A simulation study of the effects of the calving interval on milk yields of dairy cows in fixed time periods.
        Anim. Prod. 1992; 55: 309-314
        • Harel A.
        • Wagner J.
        • Zohar M.
        • Pozin Y.
        The optimal time for cows to conceive.
        Cheker Vemaas. 1989; 11 (in Hebrew): 51-58
        • Harrison D.S.
        • Meadows C.E.
        • Boyd L.J.
        • Britt J.H.
        Effects of interval to first service on reproduction, lactation and culling in dairy cows.
        J. Dairy Sci. 1974; 57 (Abstr.): 628
        • Heimann M.
        Results of an integrative computer program of fertility and production data from AI cattle population.
        in: Proceedings of the Tenth International Congress on Animal Reproduction and Artificial Insemination. Vol. 1, Urbana, IL1984
        • Holmann F.J.
        • Shumway C.R.
        • Blake R.W.
        • Schwart R.B.
        • Sudweeks E.M.
        Economic value of days open for Holstein cows of alternative milk yields with varying calving intervals.
        J. Dairy Sci. 1984; 67: 636-643
        • Israeli Holstein Herdbook Annual Report
        Israel Cattle Breeders’ Association.
        Ceasarea Industrial Park, Israel1998
        • Oltenacu P.A.
        • Rounsaville T.R.
        • Milligan R.A.
        • Foote R.H.
        Systems analysis for designing reproductive management programs to increase production and profit in dairy herds.
        J. Dairy Sci. 1981; 64: 2096-2104
        • Remer I.
        A comparison of cows with various open days, milk production, persistence and different calving seasons and its economic impact.
        Meshek Habakar Vehachalav. 1987; 210 (in Hebrew): 53-58
        • Sadeh E.
        The cost of an open day: data from the Northern Golan dairy.
        Meshek Habakar Vehachalav. 1998; 269 (in Hebrew): 31-33
      2. SAS, Users Guide: Statistics, Version 6 Edition. 1990. SAS Inst., Inc., Cary, NC.

        • Schindler H.
        • Eger S.
        • Davidson M.
        • Ochovski D.
        • Schermerhorn E.C.
        • Foote R.H.
        Factors affecting response of groups of dairy cows managed for different calving-conception intervals.
        Theriogenology. 1991; 363: 495-503
        • Schmidt G.H.
        Effect of length of calving intervals on Income Over Feed and Variable Costs.
        J. Dairy Sci. 1989; 72: 1605-1611
        • Schneider F.
        • Shelford J.A.
        • Peterson R.G.
        • Fisher L.J.
        Effects of early and late breeding of dairy cows on reproduction and production in current and subsequent lactations.
        J. Dairy Sci. 1981; 64: 1996-2002
        • Strandberg E.
        • Oltenacu P.A.
        Economic consequences of different calving intervals.
        Acta Agric. Scand. 1989; 39: 407-420
        • Weller J.I.
        • Folman Y.
        Effects of calf value and reproductive management on optimum days to first breeding.
        J. Dairy Sci. 1990; 73: 1318-1326
        • Weller J.I.
        • Bar-Anan R.
        • Osterkorn K.
        Effects of days open on annualized milk yields in current and following lactations.
        J. Dairy Sci. 1985; 68: 1241-1249