scholarly journals Effects of Feed Intake and Thermal Stress on Mammary Blood Flow and Other Physiological Measurements in Lactating Dairy Cows

1990 ◽  
Vol 73 (2) ◽  
pp. 325-332 ◽  
Author(s):  
D.S. Lough ◽  
D.L. Beede ◽  
C.J. Wilcox
Keyword(s):  
Blood Flow ◽  
Thermal Stress ◽  
Dairy Cows ◽  
Feed Intake ◽  
Lactating Dairy Cows

scholarly journals Effect of the Addition of Various Levels of Green Tea Grounds Silage at on the Feed Intake and Milk Production in Lactating Dairy Cows

2005 ◽  
Vol 76 (3) ◽  
pp. 295-301 ◽  
Author(s):  
Bayaru ERUDEN ◽  
Takehiro NISHIDA ◽  
Hiroki MATSUYAMA ◽  
Kenji HOSODA ◽  
Shigeru SHIOYA
Keyword(s):  
Dairy Cows ◽  
Green Tea ◽  
Milk Production ◽  
Feed Intake ◽  
Lactating Dairy Cows

The role of the mammary gland during heat stress

2019 ◽  
Author(s):  
◽  
Ricardo Oliveira Rodrigues
Keyword(s):  
Blood Flow ◽  
Heat Stress ◽  
Mammary Gland ◽  
Dairy Cows ◽  
Prolonged Exposure ◽  
Transcriptional Profiling ◽  
Mammary Tissue ◽  
Secretory Cells ◽  
University Of Missouri ◽  
Lactating Dairy Cows

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Disruptive effects of climate change, such as increasing environmental temperature, have direct impacts on economic viability and efficiency of food production. In lactating dairy cows, heat stress reduces milk production and alters function of mammary secretory cells, at least partly by disturbing local protein metabolism. We hypothesized that hyperthermia would not only reduce mammary blood flow but would also reduce mammary extraction of nutrients from blood. In addition, we hypothesized that transcriptional profiling of mammary tissue would reveal disruption of cellular homeostasis. Our objective was to determine the effects of hyperthermia on mammary function. More specifically, we aimed to profile mammary blood flow and the changes in mammary transcriptome of heat-stressed lactating dairy cows. We investigated the effects of early and prolonged exposure of lactating dairy cows to hyperthermia by exposing cows to programmed constantly elevated temperature and humidity to induce and maintain body temperature approximately 1[degree]C above normal. Experiments were conducted to evaluate the production responses of hyperthermic lactating dairy cows, to characterize total and nutritive mammary blood flow, and to elucidate the regulation of mammary function during early and prolonged exposure to hyperthermia. Results from these studies established that 1) hyperthermia reduces total and nutritive mammary blood flow, limiting nutrient disappearance across the mammary gland; 2) hyperthermia does not induce shunting of blood away from the gland; 3) hyperthermia affects mammary tissue transcriptome, mainly altering processes associated with ECM and cell adhesion; 4) the effects of exposure to prolonged heat stress on mammary gene expression are distinct from the effects of feed restriction, in lactating dairy cows; and 5) mammary function is reestablished within 8 days after cessation of heat stress.

Oil palm meal and urea pellet can partially replace soybean meal in the rations of lactating dairy cows

2021 ◽  
Vol 61 (1) ◽  
pp. 38
Author(s):  
Ratchataporn Lunsin ◽  
Suntriporn Duanyai ◽  
Ruangyote Pilajun
Keyword(s):  
Dairy Cows ◽  
Milk Yield ◽  
Soybean Meal ◽  
Feed Intake ◽  
Oil Palm ◽  
Milk Composition ◽  
Rumen Fermentation ◽  
Lactating Dairy Cows ◽  
Holstein Friesian ◽  
Nutrient Utilisation

Context Several agro-industrial by-products such as oil palm meal could be useful as animal feeds in support of low cost of feed for livestock production. Aims This study investigated the effects of oil palm meal and urea pellet (PMUP) as a protein replacement for soybean meal (SBM) on feed intake, nutrient digestibility, rumen fluid characteristics, milk yield and milk composition in lactating dairy cows. Methods Five multiparous, early to mid-lactation, Holstein-Friesian crossbred dairy cows (75% Holstein-Friesian × 25% Thai Native Bos indicus) were randomly allocated in a 5 × 5 Latin square design to receive PMUP replacement for SBM at 0, 25, 50, 75 and 100% in concentrate. Key results The results show that roughage, total dry matter (DM), organic matter (OM) and acid detergent fibre (ADF) intakes in the cows fed with 25–75% PMUP were significantly higher than in the cows fed 100% PMUP (P < 0.05), whereas the ether extract (EE) intake of the cows receiving the PMUP was higher than that of the control (P < 0.05). Accordingly, the apparent digestibility, ruminal ammonia nitrogen (NH3-N) and total volatile fatty acid (VFA) of cows fed with PMUP replacement of SBM at 25–75% was higher than that in cows fed with 100% PMUP. In addition, milk yield and milk composition were not significantly different among treatments, whereas feed costs per kg milk yield was lowest in cow fed with 100% PMUP (P < 0.05). Conclusions Replacing SBM with PMUP up to 50–100% in concentrate could reduce costs of feed per kg milk yield, but lower feed intake, nutrient utilisation and rumen fermentation were observed in cow fed with 100% PMUP. The use of PMUP from 25–75% replacement of SBM had no significant effects on the feed intake, nutrient utilisation, rumen fermentation and milk production. Therefore, the level of PMUP replacement of SBM in concentrate for lactating dairy cow should not exceed 75%. Implications PMUP could be used as a protein replacement for SBM in concentrate for lactating dairy cows. These findings should be applied further in practical farm condition in order to increase livestock production efficiency.

scholarly journals Predicting feed intake and feed efficiency in lactating dairy cows using digesta marker techniques

animal ◽  
2019 ◽  
Vol 13 (10) ◽  
pp. 2277-2288 ◽  
Author(s):  
A. Guinguina ◽  
S. Ahvenjärvi ◽  
E. Prestløkken ◽  
P. Lund ◽  
P. Huhtanen
Keyword(s):  
Dairy Cows ◽  
Feed Intake ◽  
Feed Efficiency ◽  
Lactating Dairy Cows

scholarly journals The Effect of Feed Intake and Growth Hormone-Releasing Factor on Lactating Dairy Cows

1995 ◽  
Vol 78 (4) ◽  
pp. 804-815 ◽  
Author(s):  
H. Lapierre ◽  
G. Pelletier ◽  
T. Abribat ◽  
K. Fournier ◽  
P. Gaudreau ◽  
...  
Keyword(s):  
Growth Hormone ◽  
Dairy Cows ◽  
Feed Intake ◽  
Growth Hormone Releasing Factor ◽  
Lactating Dairy Cows

Effect of thiabendazole treatment on feed intake, digestibility and selected blood values in lactating dairy cows

1985 ◽  
Vol 116 (10) ◽  
pp. 257-260 ◽  
Author(s):  
M. Fox ◽  
D. Jacobs ◽  
R. Campling ◽  
B. Pocknee ◽  
R. Clampitt ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Feed Intake ◽  
Lactating Dairy Cows
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