Effects of Calliandra and Sesbania on Daily Milk Production in Dairy Cows on Commercial Smallholder Farms in Kenya

Table 5

Final generalized linear mixed regression model for natural log of daily milk production for 1458 cow-visit observations from 607 farm-visits of 235 cows on 80 smallholder dairy farms near Meru, Kenya in 2016–2017, adjusting for clustering of visits within cows.

Variables and their categories	Exponentiated coefficient	Coefficient	(95% conf. Interval)		value
Amount of daily Calliandra/Sesbania (kg)	1.376^β	0.319^β	0.174^β	0.464^β	<0.0005^β
Amount of daily Calliandra/Sesbania squared (kg squared)	0.927^β	−0.076^β	−0.127^β	−0.025^β	0.003^β
Amount of daily dairy meal (kg)	1.039	0.038	0.018	0.057	<0.0005
Amount of daily maize germ (kg)	0.729	−0.316	−0.480	−0.153	<0.0005
Amount of daily maize silage (kg)	1.008	0.008	0.004	0.013	<0.0005
Sudden feed changes
No	Reference	Reference
Yes	0.901	−0.104	−0.172	−0.036	0.003
Body condition score	2.151^β	0.766^β	0.426^β	1.106^β	<0.0005^β
condition score squared	0.878^β	−0.130^β	−0.203^β	−0.057^β	0.001^β
Days in milk	0.998^β	−0.002^β	−0.002^β	−0.001^β	<0.0005^β
Days in milk squared	1.000^β	1.50^−06β	1.06^−06β	1.93^−06β	<0.0005^β
Normal appetite
No	Reference	Reference
Yes	2.018	0.702	0.433	0.971	<0.0005
Pregnant
No	Reference	Reference
Yes	0.766	−0.267	−0.323	−0.211	<0.0005
Subclinical mastitis
Negative	Reference	Reference
Positive	0.940	−0.062	−0.126	0.001	0.055
Constant	1.289	0.254	−0.199	0.706	0.272

^βVariable is part of a curvilinear relationship, and therefore coefficients cannot be interpreted in isolation but rather in combination with the other relevant coefficients for the curvilinear variable, and these combinations are best reported using a graph (Figures 3–5).