Intake and milk production of goats grazing sulla forage under different stocking rates.

Bonanno A; Di Grigoli A; Stringi L; Di Miceli G; Giambalvo D; Tornambè G; Vargetto D; Alicata Ml

Risultato della ricerca: Article

15 Citazioni (Scopus)

Abstract

This investigation aimed to individuate the dietary factors affecting the milk urea nitrogen (MUN) concentration in goats grazing herbaceous pasture and, particularly, to verify the relationship linking the diet crude protein (CP) content to MUN. A total of 205 individual observations regarding dietary and milk variables of 37 Girgentana goats involved in two experiments were used. Goats, averaging 154±14 days in milk and 38.1±5.4 kg of live weight, grazed on swards and received 500 g/d of barley meal. Sward biomass, herbage selected by goats and individual milk yield were measured and sampled weekly. The herbage intake and diet digestibility were estimated by the n-alkane method. Milk urea content was determined by an enzymatic method and transformed in MUN (MUN=urea*0.4665). The MUN concentration (9.7-35.4 mg/dl) was positively correlated with diet CP content (13.7-26.0% of dry matter (DM); r=0.76; P<0.001), pasture allowance (39-151 kg DM/goat; r=0.42; P<0.001), diet net energy for lactation concentration (NEL) (1.5-1.9 Mcal/kg DM; r=0.37; P<0.001) and milk yield (320- 2250 g/d; r=0.25; P<0.001), and negatively related with NDF (18.7-37.4% DM; r=-0.69; P<0.001) and diet digestibility (72.6-92.5%; r=-0.33; P< 0.001). The stepwise selection from dietary variables and milk yield showed dietary CP percentage to be the single variable explaining the most variation in MUN (R2=0.56; P< 0.0001). The other variables entering into the model were diet NDF, 3.5% fat-corrected milk (FCM), DM intake and NDF intake (total R2=0.66). Including the CP/NEL and CP/NDF ratios of diet in the stepwise regression model, the CP/NDF ratio alone explained 60.1% of MUN variability, followed by barley proportion in the diet, FCM and diet CP concentration, absorbing an extra 4.6% of MUN variability. A linear regression, fitting mean feeding treatment per time data of MUN and dietary CP concentration (n=28)[CP(% of DM)=6.91±1.42+0.61±0.06*MUN (mg/dl); R²=0.79; P<0.0001], suggests that MUN could be used for predicting the CP content of the diet, as a tool for developing feeding strategies aimed at balancing the rations of grazing goats through adequate supplementation. Further data from experiments on grazing goats in different environmental conditions are required in order to define a more robust relationship by which to predict the dietary CP content by MUN.
Lingua originaleEnglish
pagine (da-a)605-607
RivistaItalian Journal of Animal Science
Volume6, suppl. 1,
Stato di pubblicazionePublished - 2007

Fingerprint

Hedysarum coronarium
stocking rate
milk production
urea nitrogen
goats
grazing
forage
milk
diet
milk yield
sward
lactation
urea
digestibility
pastures
barley flour
feeding methods
milk consumption
goat milk

All Science Journal Classification (ASJC) codes

  • Animal Science and Zoology

Cita questo

Bonanno A; Di Grigoli A; Stringi L; Di Miceli G; Giambalvo D; Tornambè G; Vargetto D; Alicata Ml (2007). Intake and milk production of goats grazing sulla forage under different stocking rates. Italian Journal of Animal Science, 6, suppl. 1, 605-607.

Intake and milk production of goats grazing sulla forage under different stocking rates. / Bonanno A; Di Grigoli A; Stringi L; Di Miceli G; Giambalvo D; Tornambè G; Vargetto D; Alicata Ml.

In: Italian Journal of Animal Science, Vol. 6, suppl. 1, 2007, pag. 605-607.

Risultato della ricerca: Article

Bonanno A; Di Grigoli A; Stringi L; Di Miceli G; Giambalvo D; Tornambè G; Vargetto D; Alicata Ml 2007, 'Intake and milk production of goats grazing sulla forage under different stocking rates.', Italian Journal of Animal Science, vol. 6, suppl. 1, pagg. 605-607.
Bonanno A; Di Grigoli A; Stringi L; Di Miceli G; Giambalvo D; Tornambè G; Vargetto D; Alicata Ml. Intake and milk production of goats grazing sulla forage under different stocking rates. Italian Journal of Animal Science. 2007;6, suppl. 1,:605-607.
Bonanno A; Di Grigoli A; Stringi L; Di Miceli G; Giambalvo D; Tornambè G; Vargetto D; Alicata Ml. / Intake and milk production of goats grazing sulla forage under different stocking rates. In: Italian Journal of Animal Science. 2007 ; Vol. 6, suppl. 1,. pagg. 605-607.
@article{3c85065dd9ce4edb9de014f37051f515,
title = "Intake and milk production of goats grazing sulla forage under different stocking rates.",
abstract = "This investigation aimed to individuate the dietary factors affecting the milk urea nitrogen (MUN) concentration in goats grazing herbaceous pasture and, particularly, to verify the relationship linking the diet crude protein (CP) content to MUN. A total of 205 individual observations regarding dietary and milk variables of 37 Girgentana goats involved in two experiments were used. Goats, averaging 154±14 days in milk and 38.1±5.4 kg of live weight, grazed on swards and received 500 g/d of barley meal. Sward biomass, herbage selected by goats and individual milk yield were measured and sampled weekly. The herbage intake and diet digestibility were estimated by the n-alkane method. Milk urea content was determined by an enzymatic method and transformed in MUN (MUN=urea*0.4665). The MUN concentration (9.7-35.4 mg/dl) was positively correlated with diet CP content (13.7-26.0{\%} of dry matter (DM); r=0.76; P<0.001), pasture allowance (39-151 kg DM/goat; r=0.42; P<0.001), diet net energy for lactation concentration (NEL) (1.5-1.9 Mcal/kg DM; r=0.37; P<0.001) and milk yield (320- 2250 g/d; r=0.25; P<0.001), and negatively related with NDF (18.7-37.4{\%} DM; r=-0.69; P<0.001) and diet digestibility (72.6-92.5{\%}; r=-0.33; P< 0.001). The stepwise selection from dietary variables and milk yield showed dietary CP percentage to be the single variable explaining the most variation in MUN (R2=0.56; P< 0.0001). The other variables entering into the model were diet NDF, 3.5{\%} fat-corrected milk (FCM), DM intake and NDF intake (total R2=0.66). Including the CP/NEL and CP/NDF ratios of diet in the stepwise regression model, the CP/NDF ratio alone explained 60.1{\%} of MUN variability, followed by barley proportion in the diet, FCM and diet CP concentration, absorbing an extra 4.6{\%} of MUN variability. A linear regression, fitting mean feeding treatment per time data of MUN and dietary CP concentration (n=28)[CP({\%} of DM)=6.91±1.42+0.61±0.06*MUN (mg/dl); R²=0.79; P<0.0001], suggests that MUN could be used for predicting the CP content of the diet, as a tool for developing feeding strategies aimed at balancing the rations of grazing goats through adequate supplementation. Further data from experiments on grazing goats in different environmental conditions are required in order to define a more robust relationship by which to predict the dietary CP content by MUN.",
author = "{Bonanno A; Di Grigoli A; Stringi L; Di Miceli G; Giambalvo D; Tornamb{\`e} G; Vargetto D; Alicata Ml} and Adriana Bonanno and Luigi Stringi and Alicata, {Maria Luigia} and Dario Giambalvo and {Di Miceli}, Giuseppe and Gabriele Tornamb{\`e} and Vargetto, {Daniela Anna} and {Di Grigoli}, Antonino",
year = "2007",
language = "English",
volume = "6, suppl. 1,",
pages = "605--607",
journal = "Italian Journal of Animal Science",
issn = "1594-4077",
publisher = "PagePress",

}

TY - JOUR

T1 - Intake and milk production of goats grazing sulla forage under different stocking rates.

AU - Bonanno A; Di Grigoli A; Stringi L; Di Miceli G; Giambalvo D; Tornambè G; Vargetto D; Alicata Ml

AU - Bonanno, Adriana

AU - Stringi, Luigi

AU - Alicata, Maria Luigia

AU - Giambalvo, Dario

AU - Di Miceli, Giuseppe

AU - Tornambè, Gabriele

AU - Vargetto, Daniela Anna

AU - Di Grigoli, Antonino

PY - 2007

Y1 - 2007

N2 - This investigation aimed to individuate the dietary factors affecting the milk urea nitrogen (MUN) concentration in goats grazing herbaceous pasture and, particularly, to verify the relationship linking the diet crude protein (CP) content to MUN. A total of 205 individual observations regarding dietary and milk variables of 37 Girgentana goats involved in two experiments were used. Goats, averaging 154±14 days in milk and 38.1±5.4 kg of live weight, grazed on swards and received 500 g/d of barley meal. Sward biomass, herbage selected by goats and individual milk yield were measured and sampled weekly. The herbage intake and diet digestibility were estimated by the n-alkane method. Milk urea content was determined by an enzymatic method and transformed in MUN (MUN=urea*0.4665). The MUN concentration (9.7-35.4 mg/dl) was positively correlated with diet CP content (13.7-26.0% of dry matter (DM); r=0.76; P<0.001), pasture allowance (39-151 kg DM/goat; r=0.42; P<0.001), diet net energy for lactation concentration (NEL) (1.5-1.9 Mcal/kg DM; r=0.37; P<0.001) and milk yield (320- 2250 g/d; r=0.25; P<0.001), and negatively related with NDF (18.7-37.4% DM; r=-0.69; P<0.001) and diet digestibility (72.6-92.5%; r=-0.33; P< 0.001). The stepwise selection from dietary variables and milk yield showed dietary CP percentage to be the single variable explaining the most variation in MUN (R2=0.56; P< 0.0001). The other variables entering into the model were diet NDF, 3.5% fat-corrected milk (FCM), DM intake and NDF intake (total R2=0.66). Including the CP/NEL and CP/NDF ratios of diet in the stepwise regression model, the CP/NDF ratio alone explained 60.1% of MUN variability, followed by barley proportion in the diet, FCM and diet CP concentration, absorbing an extra 4.6% of MUN variability. A linear regression, fitting mean feeding treatment per time data of MUN and dietary CP concentration (n=28)[CP(% of DM)=6.91±1.42+0.61±0.06*MUN (mg/dl); R²=0.79; P<0.0001], suggests that MUN could be used for predicting the CP content of the diet, as a tool for developing feeding strategies aimed at balancing the rations of grazing goats through adequate supplementation. Further data from experiments on grazing goats in different environmental conditions are required in order to define a more robust relationship by which to predict the dietary CP content by MUN.

AB - This investigation aimed to individuate the dietary factors affecting the milk urea nitrogen (MUN) concentration in goats grazing herbaceous pasture and, particularly, to verify the relationship linking the diet crude protein (CP) content to MUN. A total of 205 individual observations regarding dietary and milk variables of 37 Girgentana goats involved in two experiments were used. Goats, averaging 154±14 days in milk and 38.1±5.4 kg of live weight, grazed on swards and received 500 g/d of barley meal. Sward biomass, herbage selected by goats and individual milk yield were measured and sampled weekly. The herbage intake and diet digestibility were estimated by the n-alkane method. Milk urea content was determined by an enzymatic method and transformed in MUN (MUN=urea*0.4665). The MUN concentration (9.7-35.4 mg/dl) was positively correlated with diet CP content (13.7-26.0% of dry matter (DM); r=0.76; P<0.001), pasture allowance (39-151 kg DM/goat; r=0.42; P<0.001), diet net energy for lactation concentration (NEL) (1.5-1.9 Mcal/kg DM; r=0.37; P<0.001) and milk yield (320- 2250 g/d; r=0.25; P<0.001), and negatively related with NDF (18.7-37.4% DM; r=-0.69; P<0.001) and diet digestibility (72.6-92.5%; r=-0.33; P< 0.001). The stepwise selection from dietary variables and milk yield showed dietary CP percentage to be the single variable explaining the most variation in MUN (R2=0.56; P< 0.0001). The other variables entering into the model were diet NDF, 3.5% fat-corrected milk (FCM), DM intake and NDF intake (total R2=0.66). Including the CP/NEL and CP/NDF ratios of diet in the stepwise regression model, the CP/NDF ratio alone explained 60.1% of MUN variability, followed by barley proportion in the diet, FCM and diet CP concentration, absorbing an extra 4.6% of MUN variability. A linear regression, fitting mean feeding treatment per time data of MUN and dietary CP concentration (n=28)[CP(% of DM)=6.91±1.42+0.61±0.06*MUN (mg/dl); R²=0.79; P<0.0001], suggests that MUN could be used for predicting the CP content of the diet, as a tool for developing feeding strategies aimed at balancing the rations of grazing goats through adequate supplementation. Further data from experiments on grazing goats in different environmental conditions are required in order to define a more robust relationship by which to predict the dietary CP content by MUN.

UR - http://hdl.handle.net/10447/25691

M3 - Article

VL - 6, suppl. 1,

SP - 605

EP - 607

JO - Italian Journal of Animal Science

JF - Italian Journal of Animal Science

SN - 1594-4077

ER -