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Evaluation of dry matter intake, average daily gain and faecal nitrogen excretion predicted by the Cornell Net Carbohydrate and Protein System with different beef cattle breeds fed in China

100%

Xie X. X., Meng Q. X., Ren L. P., Du J. P., Lin M.

Journal of Animal and Feed Sciences

2013

tom 22

nr 4

This study was conducted to evaluate the predictions of dry matter intake (DMI), average daily gain (ADG), and faecal nitrogen (N) excretion by the Cornell Net Carbohydrate and Protein System Version 6.1.26 (CNCPSv6) in China. A total of 71 bulls from two imported breeds, Limousin and Simmental, and three local breeds: Luxi, Jinnan and Qinchuan were selected in China. Data required by the CNCPSv6 model were collected, and model predictions were generated for animals of each breed. The regression equation between observed and predicted DMI for these cattle was: YOBS = 0.93XCNCPS + 0.48 (R2 = 0.94; P < 0.001), with an intercept not different from zero and a slope not different from unity. The proportion of deviation points lying within the range –0.4 to 0.4 kg · d–1 was 90.1%. The regression equation between observed and predicted ADG was: YOBS = 1.07XCNCPS – 0.05 (R2 = 0.92; P < 0.001), with an intercept not different from zero and a slope not different from unity. About 78.9% of points fell within the range –0.1 to 0.1 kg/d for these cattle. Model-predicted faecal N excretion for the cattle breeds was close to the observed values. The regression equation between observed and predicted faecal N excretion was: YOBS = 1.04XCNCPS – 1.48 (R2 = 0.94; P < 0.001), with an intercept not different from zero and a slope not different from unity. About 73.3% of the points fell within −4 and 4 g per day. These results show that the CNCPSv6 model using actual feed fractions can give good predictions of DMI, ADG and faecal N excretion with different beef cattle breeds in China.

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Use of hop cones in growing beef cattle nutrition

70%

Lavrencic A., Pirman T., Zgur S.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

2018

tom 57[2]

Use of hop cones in growing beef cattle nutrition. The objective of this study was to determine the effect of the supplementation of bull diets with hop cones on growing bull performance, the concentrations of blood analytes, including liver enzymes. Twenty-four growing bulls of Slovene autochthonous Cika breed (BW 373 kg; age 329 days) were randomly allocated to 6 pens (4 animals/pen). Before the start of experiment all animals received the same basic TMR which was afterwards either not supplemented (control; 2 pens) or supplemented with 50 g/animal (H50; 6 g of hop dry matter (DM)/kg diet DM; 2 pens) or 100 g of hop cones/animal (H100; 11 g DM/kg diet DM; 2 pens) daily. Bulls were weighed at the start of the experiment and then again after 30 and 60 days of experiment and average daily gain (ADG), dry matter intake (DMI) and feed-to-gain ratio (F:G) were calculated. At each weighing day, the blood samples were taken from each bull and plasma glucose and serum non-esterified fatty acids (NEFA), beta-hydroxy butyrate (BHBA), urea, alanine aminotransferase (ALT), aspartate aminotransferase (AST) and γ-glutamyl transferase (GGT) were determined. The inclusion of hop cones in the diet did not have any effects on DMI, ADG or F:G ratio and did not change BHBA, urea and GGT concentrations. ALT level was lower (P = 0.025) after 60 days of the experiment compared to control group. In treatments H50 and H100 blood glucose concentrations increased (P < 0.05) after 30 and 60 days of the experiment, while in treatment H100 NEFA concentration decreased (P = 0.022) after 60 days of the experiment. These findings suggest that hop cones and their constituents provoke changes in energy metabolism in ruminants.

Ograniczanie wyników

1 Annals of Warsaw University of Life Sciences - SGGW. Animal Science

1 Journal of Animal and Feed Sciences

1 Du J. P.

1 Lavrencic A.

1 Lin M.

1 Meng Q. X.

1 Pirman T.

1 Ren L. P.

1 Xie X. X.

1 Zgur S.

1 2018

1 2013

Wyniki wyszukiwania

Evaluation of dry matter intake, average daily gain and faecal nitrogen excretion predicted by the Cornell Net Carbohydrate and Protein System with different beef cattle breeds fed in China

Use of hop cones in growing beef cattle nutrition