Summer scour syndrome in weaned dairy calves: case series

Table 4 Grass and concentrate chemical composition, and grass trace minerals on CF and NCF

Analyses	CF					NCF				Normal references^c
	CF 1		CF 2		CF 3	NCF 1		NCF 2
	Current	Previous^a	Current	Previous^a	Current^{a, b}	Current	Previous^a	Current	Previous^a
*Grass chemical composition*
DM (g/kg)^d	268	308	272	254	245	258	244	179	187	–
CP (g/kg DM)	106	148	177	137	125	151	160	186	200	–
Ash (g/kg DM)	70	97	38	161	43	96	86	106	129	–
NDF (g/kg DM)	471	480	433	396	454	477	506	370	457	–
ADF (g/kg DM)	258	265	239	223	265	262	277	240	261	–
WSC (g/kg DM)	216	141	173	140	174	124	83	138	63	–
DMD (g/kg DM)	746	720	732	724	724	676	621	778	668	–
OMD (g/kg)	739	713	750	689	725	664	626	764	653	–
DOMD (g/kg DM)	688	643	723	565	692	596	597	679	564	–
*Grass mineral composition*
Phosphorus (%)	0.24	0.34	0.33	0.33	0.22	0.25	0.31	0.43	0.35	0.25–0.50
Potassium (%)	2.20	2.28	2.74	2.85	1.57	2.17	2.11	2.65	2.64	1.7–3.3
Calcium (%)	0.45	0.78	0.65	0.55	0.15	0.53	0.60	1.01	0.76	0.38–0.75
Magnesium (%)	0.13	0.25	0.21	0.20	0.12	0.17	0.19	0.18	0.21	0.14–0.25
Sodium (%)	0.13	0.14	0.25	0.27	0.14	0.09	0.07	0.17	0.04	0.17–0.32
Sulphur (%)	0.20	0.30	0.34	0.35	0.20	0.21	0.26	0.32	0.32	0.18–0.35
Manganese (mg/kg)	106	137	71	117	68	174	136	74	64	100–200
Copper (mg/kg)	3.0	5.3	6.6	9.0	4.0	7.4	9.5	8.2	8.3	6–12
Zinc (mg/kg)	18	25	27	34	18	23	29	25	26	25–50
Iron (mg/kg)	183	721	916	523	285	599	312	105	633	120–300
Molybdenum (mg/kg)	1.5	2.3	1.8	1.0	1.0	2.2	3.2	5.1	11.9	1.5–2.6
Selenium (µg/kg)	65	78	95	96	33	59	101	158	142	70–140
Iodine (µg/kg)	305	537	396	561	347	458	669	205	306	200–420
Cobalt (µg/kg)	118	394	285	323	132	244	198	101	306	100–180
*Concentrate chemical composition*
DM (g/kg)	884		861		886	825		866
CP (g/kg DM)	173		184		193	192		177		–
Ash (g/kg DM)	102		70		74	87		64		–
NDF (g/kg DM)	260		188		164	239		183		–
Starch (g/kg DM)	147		320		317	180		274		–

DM – dry matter; CP – crude protein; NDF – neutral detergent fibre; ADF – acid detergent fibre; WSC – water soluble carbohydrate; DMD – dry matter digestibility; OMD – organic matter digestibility; DOMD – dry organic matter digestibility; ^a Paddocks where the onset of clinical signs were observed; ^b First paddock since turnout; ^c Reference values for grass mineral were sourced from FBA laboratories; ^d DM concentration after drying

ISSN: 2046-0481