Investigations into empty body weight gain, protein, fat and energy deposition as well as into the utilization of metabolizable energy for energy deposition in black and white bulls

Abstract

From 6 series of individual feeding experiments with different energy supply (EL = 1,1 — 1,8; EL = 538 kJ/kg LW^0,75) the relationship between the intake of metabolizable energy and

live weight gain

empty body weight gain and

energy deposition

was quantified according to a nonlinear regression analysis:

intake ME (MJ/d) = A·lbe^{Blb ED, EBWG, LWG}

with

A = aA three factorial designed feeding experiment with common carp (Cyprinus carpio L.) was carried out in an intensive experimental rearing system. Fish (initial body weight 200 g) were fed on two different levels of dietary energy (16 and 18 MJ DE/kg DM), two different levels of protein (320 and 420 g CP/kg DM) and also two different feeding intensities (100% and 75% of the maximum intake). The experiment was terminated when fish reached a mean body weight of 1300 g.

Growth, feed utilization and nutrient composition of the whole body and fillet were observed. The highest growth was obtained when the fish were fed on the diet containing high dietary energy and high dietary protein with satiation feeding. High dietary energy, high dietary protein and restriction of feed intake improved feed conversion ratios. High dietary energy, low dietary protein and restrictive feeding increased energy utilization. Low dietary protein and restrictive feeding resulted in better protein utilization.

Fish fed with high dietary energy contained more fat and less protein in their carcasses. A lower fat content but higher protein and higher ash content in fish carcasses was shown when fish were fed with a diet high in protein and fed restrictively.lbLW^0,75

B = b·lbe ^{c LW}

The estimated parameters are:

Parameter f (live weight/ f (live weight/ f (live weight/

energy deposition) empty body weight gain) live weight gain)

a 0,5381 0,4553 0,4461

b 0,1207 1,0674 0,8130

c ‐0,002623 ‐0,0007659 ‐0,0003407

s_g 0,2659 0,2215 0,2217

The regression analysis made it possible to estimate the maintenance requirement. Dependent on the variable the following values for maintenance requirements were found:

energy deposition 538 kJ/kg LW^0,75

empty body weight gain 455 kJ/kg LW^0,75

live weight gain 446 kJ/kg LW^0,75

For the partial utilization of metabolizable energy for energy deposition an average value of 0,37 was obtained by suggestion of a maintenance requirement of 538 kJ/kg LW^0,75 and a nonlinear generalization of intake of metabolizable energy.

The utilization of metabolizable energy was positively influenced by the metabolizability of the energy of the diet and it was negatively influenced by the energy level.

The linear quantification of the relation between the intake of metabolizable energy and the energy deposition led to an utilization of 0,40.

Aus 6 Serien von Einzelfütterungsversuchen mit unterschiedlicher Energieversorgung (EN =1,1 —1,8; EN = 538 kJ/kg LM^0,75) wurden die Beziehungen zwischen dem Verzehr an umsetzbarer Energie und der Lebendmassezunahme,

der Leerkörpermassezunahme und

dem Energieansatz (Stufenschlachtung und Ganzkörperanalyse) über folgenden nichtlinearen Regressionsansatz verallgemeinert:

Verzehr uE (MJ/d) = A·lbe^{B·lbEA, LKMZ, LMZ}

dabe sind A = a·lbLM^0,75B = b·lbe^c‐LM

Die geschätzten Parameter sind:

Parameter f ( Lebendmassel f ( Lebendmassel f ( Lebendmassel

Energieansatz) Leerkörpermassezunahme) Lebendmassezunahme)

a 0,5381 0,4553 0,4461

b 0,1207 1,0674 0,8130

c ‐0,002623 ‐0,0007659 ‐0,0003407

s_g 0,2659 0,2215 0,2217

Der Regressionsansatz ermöglichte die Schätzung des Erhaltungsbedarfes, für den in Abhängigkeit von der Variablen folgende Werte gefunden wurden:

Energieansatz 538 kJ/kg LM^0,75

Leerkörpermassezunahme 455 kJ/kg LM^0,75

Lebendmassezunahme 446 KJ/kg LM^0,75

Für die partielle Verwertung der umsetzbaren Energie für den Energieansatz ergab sich bei Unterstellung des Erhaltungsbedarfes von 538 kJ/kg LM^0,75 und der nichtlinearen Verallgemeinerung des Verzehrs an umsetzbarer Energie ein durchschnittlicher Wert von 0,37.

Die Verwertung der umsetzbaren Energie für den Energieansatz wurde durch die Umsetzbarkeit der Energie der Ration positiv und durch das Ernährungsniveau negativ beeinflußt. Die lineare Quantifizierung der Beziehung zwischen dem Verzehr an umsetzbarer Energie und dem Energieansatz führte zu einer Verwertung von 0,40.

Key words:

• Bulls
• Metabolizable energy
• Energy deposition
• Live weight gain
• Empty body weight gain