Trimester | Average lactation length (days)a | Average calving-to-conception interval (days)b | ||||||
---|---|---|---|---|---|---|---|---|
Least square mean† | Standard error | Coefficient | p-value | Least square meanc | Standard error | Coefficient | p-value | |
Jan-March 2009 | 200.27 | 2.33 | 2.27 | 0.3540 | 165.97 | 2.81 | 9.34 | 0.0004 |
Apr-Jun 2009 | 203.17 | 2.25 | 5.17 | 0.0303 | 160.03 | 2.75 | 3.40 | 0.1815 |
Jul-Sep 2009 | 197.72 | 2.28 | −0.28 | 0.9052 | 162.91 | 2.77 | 6.28 | 0.0113 |
Oct-Dec 2009 | 200.96 | 2.27 | 2.96 | 0.1929 | 164.34 | 2.76 | 7.71 | 0.0012 |
Jan-March 2010 | 203.15 | 2.21 | 5.15 | 0.0212 | 162.01 | 2.70 | 5.38 | 0.0185 |
Apr-Jun 2010 | 201.95 | 2.18 | 3.95 | 0.0703 | 161.71 | 2.68 | 5.08 | 0.0199 |
Jul-Sep 2010 | 200.74 | 2.24 | 2.74 | 0.1935 | 162.40 | 2.73 | 5.77 | 0.0054 |
Oct-Dec 2010 | 202.14 | 2.24 | 4.14 | 0.0349 | 159.11 | 2.73 | 2.48 | 0.1921 |
Jan-March 2011 | 199.91 | 2.20 | 1.91 | 0.2916 | 158.10 | 2.71 | 1.47 | 0.3853 |
Apr-Jun 2011 | 199.82 | 2.22 | 1.82 | 0.2688 | 156.94 | 2.73 | 0.31 | 0.8338 |
Jul-Sep 2011 | 193.57 | 2.30 | −4.43 | 0.0006 | 157.47 | 2.79 | 0.84 | 0.4645 |
Oct-Dec 2011 | 198.00 | 2.30 | Ref. | - | 156.63 | 2.79 | Ref. | - |
Jan-March 2012 | 200.70 | 2.38 | 2.70 | 0.0639 | 157.42 | 2.85 | 0.79 | 0.5395 |
Apr-Jun 2012 | 206.23 | 2.50 | 8.23 | <.0001 | 158.22 | 2.91 | 1.59 | 0.3545 |