10.6084/m9.figshare.5178592.v1
Marcia Helena Machado da Rocha Fernandes
Marcia Helena Machado
da Rocha Fernandes
Ana Rebeca de Castro Lima
Ana Rebeca
de Castro Lima
Carolina Isabel Soriano Oporto
Carolina Isabel Soriano
Oporto
Raiza Felismino Silveira
Raiza Felismino
Silveira
Kleber Tomas de Resende
Kleber Tomas
de Resende
Bruno Biagioli
Bruno
Biagioli
Izabelle Auxiliadora Molina de Almeida Teixeira
Izabelle Auxiliadora Molina
de Almeida Teixeira
Temperature effect on energy partitioning and fast heat production of Anglo Nubian and Saanen goats
CBBiomet 2017
2017
basal metabolism
energy balance
facemask respirometry
respiratory rate
Environmental Management
2017-08-08 13:48:08
Journal contribution
https://cbbiomet.figshare.com/articles/journal_contribution/Temperature_effect_on_energy_partitioning_and_fast_heat_production_of_Anglo_Nubian_and_Saanen_goats/5178592
<p>The objective of this work was to determine the effect
of temperature on energy balance and basal metabolism of Saanen and Anglo
Nubian goats, using indirect calorimetry system. Six dry and non-pregnant
Saanen (53.7 ± 7.7 kg BW) and six dry and non- pregnant Anglo Nubian (56.4 ±
8.0 kg BW) goats, which were on average 5 years old, were used in a factorial
design 2 x 3 (2 breeds and 3 temperatures). The experimental period consisted
of three stages corresponding to the temperature of 10.0 ± 0.23°C, 20.0 ±
0.41°C and 35.0 ± 1.05°C. The adaptation period in each temperature lasted 21
days. Goats were allocated to individual metabolism cages to perform the
metabolism assay and gas exchange measurements concomitantly. During feeding
period, gas measurement was performed using an open-circuit facemask
respirometry in groups of four animals (two of each breed). After that, goats
were subjected to 60-h fasting (no feed) to estimate fasting heat production
(FHP) or basal metabolism. Irrespective of breed, DM intake (DMI) and organic
matter intake (OMI) decreased linearly as ambient temperature increased. During
feeding period, rectal temperature was not affect by ambient temperature, but
respiratory rate (BPM) and evaporative water loss (EWL) increased linearly with
temperature elevation. Saanen´s rectal temperature and BPM were higher than
Anglo Nubian´s. Irrespective of breed (P = 0.59), heat production (HP) showed a
quadratic effect with the lowest values at 20ºC. Conversely, FHP showed a
quadratic effect with a tendency of decreasing at increasing rate in
temperature above 20º up to 35ºC. Consequently heat increment (HI) showed
quadratic effect with a sharp increase when the ambient temperature rose from
20 to 35ºC. In conclusion, Saanen and Anglo Nubian goats are able to maintain
homeostasis in environments between 10 and 35ºC. On the other hand, the
increase in ambient temperature leads to lower intake, resulting in negative
energy balances. Above 20°C, goats tend to decrease fasting heat production, as
an attempt to spare heat load in hot environments.</p>
<p> </p>