Value of a rising‐plate meter for estimating herbage mass of grazed perennial ryegrass‐white clover swards

Michell, PJ

doi:10.1111/j.1365-2494.1982.tb01580.x

Cited by 42 publications

(25 citation statements)

References 7 publications

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“…accumulation of plant residue; Vartha and Matches, ), or by measurement error (e.g. incorrect herbage sampling, lack of constant cutting height; Michell, ). In our study, the estimation accuracy was relatively low ( R 2 < 0·7) when the number of samples was less than ten or when the range of herbage mass was less than 200 g m −2 .…”

Section: Resultsmentioning

confidence: 99%

Improving pooled calibration of a rising‐plate meter for estimating herbage mass over a season in cool‐season grass pasture

Nakagami

Itano

2013

Grass and Forage Science

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To construct a new calibration method that combines usability and accuracy for estimating herbage mass from rising‐plate meter readings, we derived four models differing in the way their parameters are related to sampling date and compared their estimation accuracies using cross‐validation. The parameters of the linear regression for each sampling date showed seasonal variations, which had a steep decrease from early April to early June and a gradual increase thereafter. The pooled models were less accurate for estimating herbage mass than a separate model, which had specific parameters for each sampling date (S model). Among the pooled models, however, those in which the parameters were assumed to be linear functions (PL model) or combined functions (PC model) of the sampling date showed substantively improved estimation accuracy compared with the traditional pooled model, in which the parameters were assumed to be fixed throughout the year (PF model). Moreover, at the beginning of the season, the models derived from previous years' data were suggested to be applicable as a practical method. Thus, it can be concluded that these types of pooled calibration could be used as ‘compromise methods’ that combine both accuracy and usability.

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Section: Resultsmentioning

confidence: 99%

Improving pooled calibration of a rising‐plate meter for estimating herbage mass over a season in cool‐season grass pasture

Nakagami

Itano

2013

Grass and Forage Science

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“…Sward height was measured using a rising-plate meter (Michell, 1982) at five sites per circular area. Extended lengths of 10 random tillers per circular area were measured using a sliding ruler.…”

Section: Methodsmentioning

confidence: 99%

Comparison of intake and digestibility of fresh Digitaria decumbens grass fed to sheep, indoors or at pasture, at two different stages of regrowth

Fanchone

Archimède

Delagarde

et al. 2012

Animal

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The effect of two feeding systems (indoors and at pasture) on intake and digestion of fresh grass was studied at two stages of regrowth (21 and 35 days of regrowth) in two parallel experiments. In Experiment 1, 10 adult Martinik rams weighing, on average, 50.5 (60.9) kg, including four fitted with rumen cannula, were randomly allocated to two groups according to a 2 3 2 Latin Square design. These rams consumed a 21-day regrowth of Digitaria decumbens grass diet during two successive 28-day periods, indoors (five rams) or at pasture (five tethered rams). In Experiment 2, 10 other Martinik rams weighing, on average, 45.5 (60.9) kg, including four fitted with rumen cannula, were randomly allocated to two groups according to a 2 3 2 Latin Square design. These rams consumed a 35-day regrowth of D. decumbens grass diet during two successive 28-day periods, either indoors (five rams) or at pasture (five tethered rams). For the indoors groups, in vivo organic matter digestibility (OMD) was measured by total collection of feces. In addition, OMD was estimated indoors and at pasture using the fecal CP (CPf ) method (OMD CPf ). Organic matter intake (OMI) was then estimated using OMD CPf and fecal organic matter output (OMI CPf ). Correlations of 0.49 and 0.77 were found between in vivo OMD and OMD CPf (P , 0.05) and between OMI and OMI CPf (P , 0.001), respectively. OMD CPf was 1.8% (P , 0.05) and 2.7% (P , 0.01) lower indoors than at pasture at 21 and 35 days of regrowth, respectively, whereas OMI CPf indoors was 1.1 and 1.16 times that registered at pasture at 21 and 35 days of regrowth, respectively. The higher OMD CPf at pasture was linked to the higher selective behavior of rams at pasture, whereas the differences in OMI CPf between the two feeding systems were linked to differences in the total bulk density of the grass. These studies show that differences in OMD CPf and OMI CPf exist between animals fed indoors and at pasture with the same forage and that these differences may vary according to the stage of regrowth of the grass offered.

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“…Hay organic matter digestibility (determined with sheep) was 0-68. To ensure good-quality grass for the following rotation, the unused paddocks were grazed by other deer or samples (Michell, 1982). The energy values of the two foods (13-32 and 9-41 MJ/kg DM) were estimated from tables (Jarrige, 1989) and corrected for deer (Brelurut, Pingard and Theriez, 1990).…”

Section: Animal Management and Measurementsmentioning

confidence: 99%

Effects of winter feeding level on the performance of red deer calves (Cervus elaphus)

1995

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The aim of this trial was to determine the effects of a high winter feeding level on the performance of red deer calves from weaning to 15 months of age. Two groups of10 calves in each group were fed indoors from weaning to turn-out on good quality hay ad libitum. They received concentrates for 197 days, the first group (treatment H) ad libitum, and the second (treatment L) a daily quantity of 616 g dry matter (DM). At turn-out the two lots were grouped together for 149 days on natural pastures containing grass species characteristic of the area. During the indoor period, treatment H calves consumed 2-5 times more concentrate than those in treatment L (272 v. 110 kg DM) and 2-8 times less hay (48 v. 234 kg DM). They weighed 19-6 kg more at turn-out (88-9 v. 69-3 kg). The difference in weight decreased to 8-8 kg at 15 months of age, but varied according to sex. This reduction of the weight gap between groups was due to the better adaptation of treatment L to pasture and to compensatory growth resulting from a higher grass intake after turn-out. It is concluded that despite the good performance of treatment H animals in winter, a high energy level of feeding is only advantageous in certain cases. It is of benefit to animals that are to be slaughtered at 1 year of age and to lateborn calves, and can improve the frame development of females in their first breeding season.

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Value of a rising‐plate meter for estimating herbage mass of grazed perennial ryegrass‐white clover swards

Cited by 42 publications

References 7 publications

Improving pooled calibration of a rising‐plate meter for estimating herbage mass over a season in cool‐season grass pasture

Improving pooled calibration of a rising‐plate meter for estimating herbage mass over a season in cool‐season grass pasture

Comparison of intake and digestibility of fresh Digitaria decumbens grass fed to sheep, indoors or at pasture, at two different stages of regrowth

Effects of winter feeding level on the performance of red deer calves (Cervus elaphus)

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