2007 Trials – List

WQSLAX | GEM244 | CUBA164 | BR52051

WQSLAX

In 2007, WQSLAX testcrosses were evaluated at two locations, Madison and Arlington. There were three replications at each location. The 38 entries consisted of 15 S5+ families from WQS C2 or C3 and 5 S4 families from LAX X B102 crossed to LH244 and LH332. The 32 testcrosses involved advanced lines from WQS C2 and LAX X B102.

The planting date at Madison was 5/7/07. The Arlington trial was planted on 5/18/07. The target planting density was 32,000 plants/acre. June and July were unseasonably dry at both locations while rainfall was above normal from August on. Hybrids susceptible to drought stress early in the season tended to lodge badly by the time of harvest. Harvest occurred on 9/4/07 at Madison and 9/13/07 at Arlington. The mean dry matter concentration at harvest was 35.2%, and the mean dry matter yield was 9.00 tons/acre.

Based on forage yield, 19 testcrosses and 6 checks were chosen for nutritional evaluation (WQSLAX – Forage yield evaluation). Nutritional evaluations included assessment of neutral detergent fiber (NDF), in vitro true digestibility (IVD), in vitro NDF digestibility (IVNDFD), crude protein (CP), and starch concentration. Based on these values, milk/ton of forage and milk/acre were estimated based on MILK2006, which uses forage composition (NDF, IVD, IVNDFD, CP, and starch) to estimate potential milk production per ton of forage. Forage yield is then used to estimate potential milk per acre (WQSLAX – Forage quality evaluation).

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GEM244

In 2007, GEM244 testcrosses were evaluated at two locations, Madison and Arlington. There were three replications at each location. The 45 entries consisted of 39 S5+ families crossed to LH244 and 6 hybrid checks. The 39 testcrosses involved advanced GEM lines derived from AR17056, DK212T, FS8B(T), SCRO1, and CHO5015.

The planting date at Madison was 5/7/07. The Arlington trial was planted on 5/18/07. The target planting density was 32,000 plants/acre. June and July were unseasonably dry at both locations while rainfall was above normal from August on. Hybrids susceptible to drought stress early in the season tended to lodge badly by the time of harvest. Harvest occurred on 9/5/07 at Madison and 9/19/07 at Arlington. The mean dry matter concentration at harvest was 37.1%, and the mean dry matter yield was 9.81 tons/acre.

Based on forage yield, 22 testcrosses and 6 hybrid checks were chosen for nutritional evaluation (GEM244 – Forage yield evaluation). Nutritional evaluations included assessment of neutral detergent fiber (NDF), in vitro true digestibility (IVD), in vitro NDF digestibility (IVNDFD), crude protein (CP), and starch concentration. Based on these values, milk/ton of forage and milk/acre were estimated based onMILK2006, which uses forage composition (NDF, IVD, IVNDFD, CP, and starch) to estimate potential milk production per ton of forage. Forage yield is then used to estimate potential milk per acre (GEM244 – Forage quality evaluation).

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CUBA164

In 2007, CUBA164 testcrosses were evaluated at two locations, Madison and Arlington. There were three replications at each location. The 30 entries consisted of 24 S6+ families derived from CUBA164:S2012 and CHI755:S1911b crossed to LH279, LH287, and W604S, as well as 6 hybrid checks.

The planting date at Madison was 5/10/07. The Arlington trial was planted on 5/21/07. The target planting density was 32,000 plants/acre. June and July were unseasonably dry at both locations while rainfall was above normal from August on. Hybrids susceptible to drought stress early in the season tended to lodge badly by the time of harvest. Harvest occurred on 9/11/07 at Madison and 9/14/07 at Arlington. The mean dry matter concentration at harvest was 34.9%, and the mean dry matter yield was 9.44 tons/acre.

Based on forage yield, 15 testcrosses and 6 hybrid checks were chosen for nutritional evaluation (CUBA164 – Forage yield evaluation). Nutritional evaluations included assessment of neutral detergent fiber (NDF), in vitro true digestibility (IVD), in vitro NDF digestibility (IVNDFD), crude protein (CP), and starch concentration. Based on these values, milk/ton of forage and milk/acre were estimated based onMILK2006, which uses forage composition (NDF, IVD, IVNDFD, CP, and starch) to estimate potential milk production per ton of forage. Forage yield is then used to estimate potential milk per acre (CUBA164 – Forage quality evaluation).

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BR52051

In 2007, BR52051 testcrosses were evaluated at two locations, Madison and Arlington. There were three replications at each location. The 45 entries consisted of 39 S6+ GEM famiies derived from BR52051, SCRO1, and CHO5015 crossed to LH244 and LH332 along with 6 hybrid checks.

The planting date at Madison was 5/7/07. The Arlington trial was planted on 5/18/07. The target planting density was 32,000 plants/acre. June and July were unseasonably dry at both locations while rainfall was above normal from August on. Hybrids susceptible to drought stress early in the season tended to lodge badly by the time of harvest. Harvest occurred on 9/6/07 at Madison and 9/19/07 at Arlington. The mean dry matter concentration at harvest was 38.6%, and the mean dry matter yield was 9.62 tons/acre.

Based on forage yield, 30 testcrosses and 6 hybrid checks were chosen for nutritional evaluation (BR52051 – Forage yield evaluation). Nutritional evaluations included assessment of neutral detergent fiber (NDF), in vitro true digestibility (IVD), in vitro NDF digestibility (IVNDFD), crude protein (CP), and starch concentration. Based on these values, milk/ton of forage and milk/acre were estimated based onMILK2006, which uses forage composition (NDF, IVD, IVNDFD, CP, and starch) to estimate potential milk production per ton of forage. Forage yield is then used to estimate potential milk per acre (BR52051 – Forage quality evaluation).

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